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10 Steps to Install Corrugated Metal Roofing

There are many styles of metal roofing in the market, but one of the most commonly found options is corrugated metal roofing. This type of metal roofing is easy to install, relatively inexpensive, and long-lasting. It is also very durable and can withstand the elements well, so if you are interested in a roofing option that is strong, durable, and will last for many years to come, you may want to consider corrugated metal roofing.

Corrugated metal roofing is available in a variety of materials, including aluminum, steel, copper, and zinc. Each of these materials has its own advantages and disadvantages, so it’s essential to research each one carefully before making a decision. For example, aluminum is lightweight and rust-resistant, while steel is stronger and more durable. Copper is more expensive than aluminum or steel, but it is also more resistant to corrosion. Zinc is a good option for areas with a lot of moisture.

Once you have chosen the right material for your corrugated metal roofing, you will need to determine the correct size and shape. Corrugated metal roofing panels come in a variety of sizes and shapes, so it is important to measure your roof carefully before ordering panels. You will also need to decide how you want the panels to overlap. The amount of overlap will affect the strength and durability of your roof.

Materials and Tools Required

Materials

Corrugated metal roofing panels: These panels are made from galvanized steel, aluminum, or other corrosion-resistant materials. Choose panels with a thickness and corrugation profile that suit your specific needs.

Underlayment: This is a waterproof barrier that is installed beneath the metal panels to prevent water penetration. It can be made from roofing felt, synthetic underlayment, or other approved materials.

Flashing: Flashing is used to seal gaps and transitions around chimneys, vents, and other roof features to prevent water damage. It is typically made from the same material as the roofing panels.

Sealants and adhesives: These materials are used to seal joints and prevent leaks. Choose sealants and adhesives that are compatible with the roofing materials and your specific climate.

Fasteners: Roofing nails or screws are used to secure the metal panels to the roof deck. Choose fasteners that are made from corrosion-resistant materials and are the appropriate length for the thickness of your roofing panels.

Tools

Tool	Purpose
Circular saw	Cutting metal roofing panels
Drill	Drilling holes for fasteners
Snips	Trimming metal roofing panels
Measuring tape	Measuring and marking cuts
Chalk line	Snapping chalk lines to guide installation
Level	Ensuring that the roofing panels are level
Safety glasses	Protecting eyes from flying debris
Gloves	Protecting hands from sharp edges

In addition to these materials and tools, you may also need scaffolding, ladders, or other equipment to safely access and work on the roof.

Preparing the Roof Deck

Before installing the metal panels, it’s crucial to prepare the roof deck properly to ensure a secure and long-lasting installation.

Inspecting and Repairing the Roof Deck

Before any roofing work, thoroughly inspect the roof deck for any damage or deterioration. Repair any holes, cracks, or punctures with appropriate materials. Also, check for soft spots on the decking that may indicate underlying structural issues.

Installing a Roof Underlayment

To further protect the roof deck from moisture and enhance the overall roof performance, consider installing a layer of roof underlayment. This underlayment creates a waterproof barrier and adds an extra layer of protection against leaks. Choose a high-quality underlayment suitable for use with metal roofing.

Recommended Roof Underlayment Types:
Felt paper
Synthetic underlayment

Lay the underlayment parallel to the eaves, starting from the bottom of the roof and overlapping each row by at least 6 inches. Secure the underlayment with roofing nails or staples.

Installing the Drip Edge

Installing the drip edge is essential to prevent water from penetrating beneath the roofing material and causing damage to the roof deck or interior of the building. Follow these steps to properly install the drip edge:

Measure and cut the drip edge: Measure the length of the eave and cut the drip edge to the corresponding length using tin snips.
Position the drip edge: Place the drip edge along the eave, with the flange facing down. Ensure that the drip edge extends at least 1 inch beyond the edge of the roof deck.
Secure the drip edge: Use roofing nails or screws to secure the drip edge to the roof deck. Space the nails or screws at intervals of 12-18 inches along the length of the drip edge. Ensure that the nails or screws penetrate the flange of the drip edge and into the roof deck.

Seal the seams: If multiple pieces of drip edge are used, overlap the seams by at least 6 inches and seal the overlap with roofing cement or sealant to prevent water infiltration.

Tool	Purpose
Tin snips	Cutting the drip edge
Roofing nails or screws	Securing the drip edge to the roof deck
Roofing cement or sealant	Sealing the seams between drip edge pieces

Laying the First Row of Panels

Step 1: Square Up the First Panel

Measure from the end of the roof to the desired starting point for the first panel.
Snap a chalk line perpendicular to the edge of the roof, ensuring it is parallel to the eaves.
Place the first panel flush against the chalk line and square it up to ensure it is perfectly aligned with the roof.

Step 2: Secure the First Panel

Use self-tapping screws specifically designed for corrugated metal roofing.
Screw through the panel’s top rib and into the roof sheathing at every other rib.
Stagger the screws on the next row to enhance the panel’s stability.

Step 3: Overlap the Remaining Panels

Position the next panel on top of the first panel, overlapping by the specified amount (typically 2-3 ribs).
Line up the overlapping ribs and secure the panels together using the same screw pattern as the first panel.

Step 4: Ensuring Proper Alignment

Continuously check the alignment and squareness of the panels using a level or chalk line.
If necessary, make small adjustments to the panel’s position before securing it to the roof.
Pay close attention to the positioning of the panels at the eaves and gable ends to ensure they align properly and create a clean, finished look.

Securing the Panels with Roofing Screws

Once the panels are in place, they need to be secured with roofing screws. These screws are specifically designed for metal roofing and have a neoprene washer that helps to seal the hole and prevent leaks. To install the screws, use a drill or impact driver with a magnetic bit. Start by drilling a pilot hole through the panel and the purlin or batten. Then, insert the screw and tighten it until the washer is snug against the panel.

The following table provides the recommended screw spacing for corrugated metal roofing:

Panel Width (inches)	Screw Spacing (inches)
24	12
36	18
48	24

In addition to the recommended screw spacing, you should also install screws at any overlaps or seams in the panels. This will help to keep the panels in place and prevent them from coming apart.

Once all of the screws are installed, you can inspect the roof for any leaks. To do this, use a hose to spray water on the roof and look for any water that comes through. If you find any leaks, you can seal them with a roofing sealant.

Overlapping and Aligning the Panels

Proper overlapping and alignment of panels is crucial for a durable and weathertight roof. Here’s how to do it:

1. Determine Side Overlap

Calculate the required side overlap based on your panel’s width and rib profile. The overlap should typically be between 1-2 ribs.

2. Measure and Mark

Mark the desired overlap distance on the panel’s side edge. Use a pencil or chalk line to ensure accuracy.

3. Align Panels

Place the adjacent panel on the roof, aligning it with the overlap marks on the previous panel. Use a straight edge or string to check for alignment.

4. Insert Screws

Insert galvanized or stainless steel roofing screws through the overlap, starting a few inches from the edge. Drive the screws perpendicular to the roof surface.

5. Spacing and Pattern

Follow the manufacturer’s recommended screw spacing and pattern. Typically, screws should be spaced 12-18 inches apart along the overlap.

6. End Laps and Fastening

At roof ends, overlap the panels by at least 12 inches. Use longer roofing screws to penetrate through both panels and the rafter or fascia. The following table provides guidelines for end lap fastening:

Panel Width	Overlap Amount	Screw Size (Length)
24 inches	12 inches	1-1/2 to 2 inches longer than sheet thickness
30 inches	15 inches	2 to 2-1/2 inches longer than sheet thickness
36 inches	18 inches	2-1/2 to 3 inches longer than sheet thickness

Installing the Ridge Cap

The ridge cap is the highest point of your roof and is responsible for protecting it from water damage. It is important to properly install the ridge cap in order to ensure the longevity of your roof.

Materials You Will Need

Ridge cap shingles
Roofing nails
Roofing cement
Caulk gun
Caulk

Step-by-Step Instructions

Measure and cut the ridge cap shingles: Measure the length of the ridge and cut the ridge cap shingles to the appropriate length.
Apply roofing cement to the ridge: Apply a bead of roofing cement along the ridge line.
Place the ridge cap shingles: Place the ridge cap shingles over the roofing cement, overlapping them by at least 2 inches.
Nail the ridge cap shingles: Nail the ridge cap shingles into place using roofing nails. Space the nails approximately 6 inches apart.
Apply caulk to the seams: Apply a bead of caulk along the seams between the ridge cap shingles. This will help to prevent water from leaking into the roof.
Smooth the caulk: Use your finger or a caulk tool to smooth the caulk and remove any excess.
Inspect the ridge cap: Once the ridge cap is installed, inspect it for any gaps or leaks. If you find any gaps, apply additional caulk or roofing cement to seal them.

| Additional Tips |
|—|—|
| – Use a chalk line to mark the ridge line before applying the roofing cement. |
| – If the ridge is long, you may need to use a ladder to reach the top. |
| – Be careful not to over-tighten the roofing nails, as this can damage the shingles. |
| – Allow the caulk to dry completely before exposing it to the elements. |

Finishing Touches

Once the panels are secured, you can add finishing touches to complete the installation.

8. Ridge Cap

A ridge cap is installed along the peak of the roof to cover the exposed edges of the panels and prevent water from penetrating. Ridge caps are typically made of the same material as the roofing panels and are available in various shapes and sizes.

Type	Description
Box Cap	A rectangular cap that covers the ridge and is sealed with a ridge roll
Cone Cap	A conical cap that mounts to the ridge and is designed to withstand high winds
Arch Cap	An arched cap that provides a decorative touch to the ridge and is often used on residential roofs

To install a ridge cap, simply slide it over the panels at the peak and secure it with screws. Ensure that the ridge cap overlaps the panels by at least 4 inches on each side.

Here are some additional tips for installing ridge caps:

Use a sealant or flashing tape to create a watertight seal between the ridge cap and the panels.
Secure the ridge cap with both screws and adhesive to ensure it stays in place during high winds.
If the ridge cap is too long, you can cut it using a metal shears or a circular saw fitted with a metal blade.

Maintenance and Inspection

Regular maintenance and inspections are crucial for maintaining the longevity and performance of your corrugated metal roof. Here’s a detailed guide to ensure proper upkeep:

Cleaning

Remove debris, leaves, and dirt from the roof surface to prevent corrosion and ensure optimal water flow. Use a soft brush or spray nozzle with water, avoiding harsh chemicals or abrasive scrubbing.

Sealant Inspection

Check for cracks or gaps in the sealant around penetrations, such as pipes or vents. Apply additional sealant if necessary to prevent water infiltration.

Seam Inspection

Examine the seams between the panels for any signs of separation or leakage. If any gaps are found, reseal them using compatible sealant.

Fastener Tightening

Inspect and tighten any loose fasteners, such as screws or bolts, using a screwdriver or wrench. Ensure they are securely fastened to prevent panels from shifting or lifting.

Flashing Integrity

Check the flashing around chimneys, valleys, and edges of the roof for damage or corrosion. If necessary, replace or repair damaged flashing to ensure proper water drainage.

Gutter Cleaning

Clear gutters regularly to prevent water buildup and overflow. Remove leaves, debris, and other obstructions that can clog the gutters and cause water damage.

Ventilation Inspection

Check for proper ventilation under the roof to prevent moisture buildup. Ensure vents are functioning and not obstructed by insulation or debris.

Moisture Prevention

Take steps to minimize moisture penetration by sealing penetrations, adding insulation to the attic, and using proper flashing techniques.

Professional Inspection

Consider getting a professional roof inspection every few years to thoroughly assess the roof’s condition and identify any potential issues early on.

Record Keeping

Date	Maintenance Performed	Inspector
[Date]	[Description of Maintenance]	[Inspector’s Name]

Maintain a record of all maintenance and repairs performed on the corrugated metal roof for future reference and warranty purposes.

How To Install Corrugated Metal Roofing

Corrugated metal roofing is a popular choice for many homes and businesses because it is durable, affordable, and easy to install. If you are considering installing corrugated metal roofing on your home or business, there are a few things you need to know.

First, you need to choose the right type of corrugated metal roofing. There are two main types of corrugated metal roofing: galvanized steel and aluminum. Galvanized steel is the most common type of corrugated metal roofing, and it is made of steel that has been coated with a layer of zinc to protect it from rust.

Aluminum corrugated metal roofing is more expensive than galvanized steel, but it is also more durable and lightweight.

Once you have chosen the right type of corrugated metal roofing, you need to determine how much you need. To do this, you need to measure the length and width of the area you want to cover. You also need to add a few extra feet to allow for overlap.

Once you have determined how much corrugated metal roofing you need, you can purchase it from a local home improvement store or online.

To install corrugated metal roofing, you will need the following tools and materials:

Corrugated metal roofing
Self-tapping screws
A drill
A saw
Safety glasses
Gloves

Once you have all of the necessary tools and materials, you can begin installing the corrugated metal roofing.

1. Start by installing the flashing. Flashing is a thin sheet of metal that is used to seal the joints between the roofing panels and the roof deck.

2. Next, install the roofing panels. The roofing panels are typically installed in rows, starting at the bottom of the roof.

3. Overlap the roofing panels by at least 6 inches.

4. Secure the roofing panels to the roof deck using self-tapping screws.

5. Once all of the roofing panels have been installed, you can trim any excess material.

7 Steps to Properly Attach Corrugated Roofing

Learning how to attach corrugated roofing is a crucial step in constructing a robust and weather-resistant roof. This type of roofing material, characterized by its distinctive wavy pattern, offers several advantages, including durability, ease of installation, and versatility. Whether you’re a seasoned roofer or a DIY enthusiast, mastering the techniques of corrugated roofing installation is essential for ensuring a secure and long-lasting roof.

Before embarking on the installation process, it’s important to gather the necessary tools and materials. These include corrugated roofing panels, roofing screws, a drill with a driver bit, a measuring tape, a chalk line, and safety gear such as gloves and eye protection. Additionally, selecting high-quality roofing panels and accessories from reputable manufacturers is crucial for ensuring the longevity and performance of your roof.

The installation process begins with preparing the roof deck. This involves ensuring that the deck is level, square, and free of any debris or imperfections. Proper preparation of the deck is critical for the overall stability and integrity of the roof. Once the deck is ready, the corrugated roofing panels can be laid out and secured with roofing screws. The panels should be overlapped by a minimum of one corrugation, and the screws should be driven into the peaks of the corrugations. By following these steps carefully and paying attention to details, you can achieve a professional-looking and weather-resistant corrugated roof that will provide years of protection and curb appeal.

Selecting the Right Corrugated Roofing Panels

The selection of corrugated roofing panels is a crucial step in ensuring the durability and performance of your roofing system. Consider the following factors to make an informed decision:

Material:

Galvanized Steel: Durable, resistant to corrosion, and available in a variety of finishes.

Aluminum: Lightweight, corrosion-resistant, and fire-resistant, but more expensive than galvanized steel.

Polycarbonate: Translucent or opaque panels that allow natural light to pass through, suitable for greenhouses or covered walkways.

PVC: Lightweight, weather-resistant, and available in various colors and profiles.

Thickness:

The thickness of the panels, measured in gauges, affects their strength and durability. Higher gauges indicate thicker panels, which are more resistant to impact and deformation.

Profile:

The profile refers to the shape of the corrugations. Common profiles include:

Profile	Characteristics
Sinusoidal	Semi-rounded waves, providing a classic and aesthetically pleasing look.
Trapezoidal	Straight ribs and a flat surface, offering high strength and wind resistance.
Corrugated	Parallel ridges and valleys, providing good water runoff and durability.

Color and Finish:

Corrugated roofing panels come in various colors and finishes. Consider the aesthetic appeal, heat reflectivity, and durability when selecting the appropriate option.

Accessories:

Accessories such as ridge caps, flashings, and fasteners play a vital role in the functionality and integrity of the roofing system. Ensure that the selected panels are compatible with the available accessories.

Preparing the Roofing Surface

1. Inspection and Cleaning

Before installing corrugated roofing, ensure that the underlying surface is structurally sound and free from any defects. Thoroughly inspect the area for any damaged or rotten roofing materials, as these will need to be replaced before proceeding. Additionally, remove any dirt, debris, or algae that may have accumulated on the surface using a broom or power washer.

2. Laying Roofing Felt

Laying roofing felt as an underlayment provides an additional layer of protection for your roof and helps prevent moisture penetration. Choose a roofing felt with sufficient weight (15-30 pounds per square) and that is compatible with your type of roofing material. Start by rolling out the roofing felt parallel to the eaves, ensuring that it overlaps by at least 6 inches at the seams. Secure the felt using roofing nails or staples, spacing them every 6-8 inches along the edges and every 12-18 inches in the field.

3. Marking Nail Lines and Overlaps

Once the roofing felt is in place, mark the nail lines where the corrugated roofing will be secured. To ensure proper alignment, use a chalk line or a string to create parallel lines spaced according to the manufacturer’s recommendations. Similarly, determine the required overlap for each sheet of roofing by following the manufacturer’s instructions. Typically, the side laps should overlap by 1-2 corrugations, and the end laps by 6-12 inches.


Roofing Felt Characteristics:	Weight: 15-30 pounds per square Type: Compatible with the chosen roofing material Overlap: 6 inches at the seams Secure: Roofing nails or staples every 6-8 inches (edges) and 12-18 inches (field)

Positioning the Corrugated Roofing Panels

Step 1: Calculate Overlap and Eave Extension

Determine the overlap between adjacent panels and the overhang at the eaves. Typically, 6-12 inches of overlap is recommended, and an eave extension of 8-12 inches helps protect against rain and wind.

Step 2: Plan Panel Alignment

Align the first panel at the corner of the roof, with the edge of the panel flush with the eave and the top edge aligned with the desired starting point. Fasten the panel securely using roofing screws.

Step 3: Position Subsequent Panels

Positioning for Lengthwise Overlap:

Distance from Previous Panel	Overlap Amount
1 Corrugation	1/2 to 1 corrugation
2 Corrugations	3/4 to 1 corrugation
3 Corrugations	1 to 1-1/4 corrugations

Positioning for Side Lap: Overlap by 1-2 corrugations, ensuring the ribs of the panels align for proper water drainage.

Fastening: Secure the panels to purlins or roof framing using roofing screws with washers. Space screws 3-4 inches apart along ribs and 6-12 inches apart at side laps.

Securing the Panels with Nails or Screws

Once the roofing panels are in place, they must be securely fastened to the roof deck. This can be done using either nails or screws.

Nails are the traditional method of securing corrugated roofing, and they are still widely used today. However, screws are becoming increasingly popular, as they offer several advantages over nails.

Screws are self-tapping, which means that they do not require a pilot hole. This makes them easier to install than nails, especially in thicker roofing materials.

Screws also provide a more secure hold than nails. This is because they have a larger surface area than nails, and they are less likely to pull out of the roofing material.

When choosing fasteners for corrugated roofing, it is important to consider the following factors:

The type of roofing material
The thickness of the roofing material
The slope of the roof
The climate in which the roof is located

Number and Placement of Fasteners

The number and placement of fasteners required for corrugated roofing will vary depending on the factors listed above. However, as a general rule of thumb, the following spacing should be used:

Roof Slope	Fastener Spacing
Less than 3:12	6 inches on center
3:12 to 6:12	8 inches on center
Greater than 6:12	12 inches on center

Fasteners should be placed in the center of the corrugations, and they should be driven in straight. Overdriving fasteners can damage the roofing material.

In addition to the fasteners listed above, it is also recommended to use ridge caps and flashing to seal the roof and prevent leaks.

Installing Ridges and Flashings

Installing ridges and flashings is a crucial step in completing your corrugated roofing system. Here’s a detailed guide to ensure a watertight and durable roof:

Ridge Caps

Ridge caps cover the peak of the roof, where two roof panels meet. They prevent water from penetrating and ensure a smooth transition between panels.

Position the first ridge cap at one end of the ridge and secure it using roofing screws.
Overlapping the next ridge cap by 6-12 inches, slide it into place and fasten it.
Continue installing ridge caps along the entire length of the ridge, ensuring proper overlap.

End Caps

End caps seal the exposed ends of the roof panels. They prevent water infiltration and provide a finished look.

Measure and cut end caps to the appropriate length.
Slide the end caps over the exposed end of the roof panel and secure them using roofing screws.
Ensure that the end caps overlap the ridge caps for added protection.

Side Flashings

Side flashings are strips of metal that are installed along the sides of the roof, where it meets walls or other structures. They prevent water from seeping through gaps and ensure a weathertight seal.

Measure and cut side flashings to the desired length.
Fold one edge of the flashing over the top of the roof panel and secure it using roofing screws.
Bend the other edge of the flashing downward against the wall or structure and fasten it.
Overlapping the adjacent flashing by 4-6 inches, continue installing side flashings along the entire length.

Component	Function
Ridge Caps	Cover the peak of the roof and prevent water penetration
End Caps	Seal the exposed ends of the roof panels and provide a finished look
Side Flashings	Prevent water infiltration along the sides of the roof and ensure a weathertight seal

Sealing Seams and Joints

Properly sealing seams and joints is crucial to prevent water infiltration and ensure a watertight roof. Follow these steps to achieve a weatherproof seal:

1. Clean the Surfaces

Remove any dirt, debris, or rust from the surfaces to be sealed.

2. Apply a Primer (Optional)

Apply a rust-resistant primer to the exposed metal surfaces to enhance adhesion.

3. Use Self-Tapping Screws

Secure the corrugated panels using self-tapping screws with neoprene washers or rubber grommets. The screws should be driven through the peaks of the corrugations.

4. Apply Sealant

Apply a generous bead of sealant along the overlapping edges of the panels and at the joints between the panels and roof penetrations (e.g., vents, chimneys).

5. Install Overlap Flashing

For roof penetrations, install flashing over the sealant and extend it over the surrounding corrugated panels.

6. Seal Lap Joints

For side lap joints between corrugated panels, apply a wide strip of self-adhesive bitumen tape or use mastic sealant to create a waterproof seal.

7. Cover Seams with Trim

To enhance the seal, cover the seams with corrugated trim that overlaps the edges of the panels. Secure the trim using self-tapping screws and sealant.

Flashing Details

Type of Penetrations	Flashing Details
Vents	Install a saddle vent over the roofing and use flashing tape or mastic sealant to create a watertight seal.
Chimneys	Install a cricket or saddle flashing around the chimney and extend it over the corrugated panels.
Pipe Vents	Use pipe flashing specifically designed for corrugated roofing and seal the base with sealant.

Using Proper Safety Equipment

Before beginning any roofing work, proper safety equipment must be worn. This includes gloves, safety glasses, ear protection, and appropriate footwear.

Gloves: Use heavy-duty work gloves to protect your hands from sharp edges and debris.

Safety Glasses: Wear safety glasses with side shields to prevent debris from entering the eyes.

Ear Protection: Use earplugs or ear muffs to protect your hearing from noise generated by power tools and heavy equipment.

Footwear: Wear sturdy work boots with non-slip soles to prevent falls.

Additional Tips:

Inspect all tools and equipment before use to ensure they are in good working order.
Follow the instructions provided by the manufacturer of the roofing materials.
Be aware of your surroundings and watch for potential hazards.
Use a ladder rated for the height of the work area.
Do not work on the roof in inclement weather.

Types of Roofing Nails

Corrugated roofing panels come with a variety of different types of nails. The type of nail you use will depend on the type of roofing panel you have and the climate where you live.

The following table lists the most common types of roofing nails and their corresponding uses:

Nail Type	Use
Galvanized Nails	Galvanized nails are the most common type of roofing nail. They are made of steel that has been coated with a layer of zinc to prevent rust. Galvanized nails are suitable for use in most climates.
Stainless Steel Nails	Stainless steel nails are more expensive than galvanized nails, but they are also more durable. Stainless steel nails are not subject to rust and can withstand harsh weather conditions.
Aluminum Nails	Aluminum nails are lightweight and corrosion-resistant. They are a good choice for use in coastal areas or other areas where the climate is harsh.

How To Attach Corrugated Roofing

Corrugated roofing is a popular choice for many types of buildings, including sheds, garages, and barns. It is a relatively inexpensive and easy-to-install material that can provide years of protection from the elements. If you are planning to install corrugated roofing, it is important to follow the manufacturer’s instructions carefully. However, here are some general tips on how to attach corrugated roofing:

Start by measuring and cutting the roofing panels to the desired length. The panels should overlap each other by at least 6 inches at the sides and 12 inches at the ends.
Install the roofing panels by starting at the bottom edge of the roof and working your way up. Secure the panels to the roof rafters with screws or nails, spacing them about 12 inches apart.
Overlap the panels by at least 6 inches at the sides and 12 inches at the ends. This will help to prevent water from leaking into the building.
Seal the seams between the panels with roofing cement. This will help to keep water out and prevent the panels from shifting.
Install flashing around the edges of the roof, chimneys, and other openings. This will help to prevent water from leaking into the building.

Once you have installed the corrugated roofing, it is important to inspect it regularly for any damage or loose panels. Repair any damage promptly to prevent water from leaking into the building.