A Comprehensive Guide to Installing Gutter Downpipe

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Close-up of a white brick wall featuring a red numbered sign with a white gutter pipe.
Credit: pexels.com, Close-up of a white brick wall featuring a red numbered sign with a white gutter pipe.

Installing gutter downpipe can be a bit of a challenge, but with the right tools and knowledge, it's definitely doable.

First, you'll need to determine the correct length of downpipe required for your gutter system. This will depend on the length of your gutters and the slope of your roof, as explained in the "Calculating Downpipe Length" section.

The standard downpipe size is 68mm, which is suitable for most residential properties. However, if you have a large roof or a lot of rainfall, you may need to consider a larger downpipe size, such as 76mm or 89mm, as mentioned in the "Choosing the Right Downpipe Size" section.

To start the installation process, you'll need to remove any existing downpipe and guttering system. This will give you a clean slate to work with and ensure that your new system is properly installed.

What You Need to Know

Before you start installing gutter downpipe, make sure you have the right materials, including a gutter downpipe, downspout elbows, and a downspout outlet.

Choose the right location for the downspout outlet, considering factors like drainage and water flow.

A 10-15 degree slope is ideal for gutter downpipes to ensure proper water flow and prevent clogging.

The Purpose of Gutter Downpipes

Credit: youtube.com, Understanding Gutter Downspouts | Ask This Old House

Gutters are a crucial part of a home's foundation, as they help move water away from the house, preventing erosion and dampness.

Rainwater from the roof is a major source of water against the foundation, and gutters collect this water to redirect it away from the house.

A rain gutter system is designed to collect and move water away from the house, improving its overall health by preventing wood rot, cracking concrete, and mold growth.

Water seeping into the soil around the foundation can push its way into the foundation, causing dampness that will eventually find its way into the house.

The Basics

Gutters are made of materials that can withstand water, such as aluminum or vinyl. These materials are chosen for their durability and resistance to rot and rust.

Fasteners should be used every 18 to 24 inches, depending on the snow load. This ensures that the gutters remain securely attached to the house.

Close-up of rainwater flowing from a gutter during a storm, capturing the essence of rainy weather.
Credit: pexels.com, Close-up of rainwater flowing from a gutter during a storm, capturing the essence of rainy weather.

Gutters are typically 10 feet long, but can be joined together using connectors and sealant to create longer runs. This is especially useful for homes with larger roofs.

The slope of the gutter is crucial for proper water flow. Each section of gutter should be slightly higher on the closed end, slowly angling towards the end with the downspout. A common slope is 1/4 inch over 10 feet.

Downspouts are placed at the low point of the gutter system, using a downspout adapter and sealant. They carry water away from the house and towards the ground.

Gutters come in various sizes, typically 5 or 6 inches wide. The size of the gutter is determined by the pitch of the roof and average rainfall amounts in your area.

Preparation and Planning

Before you start installing gutter downpipe, it's essential to plan and prepare the area. Measure the length of the roof that will receive gutters, taking into account the usable length of parts like corners and downspout adapters.

Credit: youtube.com, HOW TO INSTALL GUTTERS - A DIY GUIDE

To ensure a smooth installation process, mark the starting point of the gutter run 1.25 inches below the eaves flashing. This will help you determine the correct placement of the gutter.

When figuring out the amount of gutters needed, consider the length of the gutter run and add an inch to each end for a bit of overhang. It's also crucial to measure the length to the ground from the bottom of the fascia to determine the downspout length.

Roof Measurement and Materials Purchase

Measuring the roof is a crucial step in installing gutters, and it's essential to get it right. Measure the length of the roof, including any overhangs, to determine the total length of gutter needed.

The length of the gutter should run the entire length of the roof, ending with a downspout. If the gutter run measures longer than 40 feet, it should be positioned to pitch down from the middle, aimed toward a downspout at each end.

Credit: youtube.com, How to measure a roof and calculate square feet. | 01/2020

You'll need to purchase at least the total length of gutter, along with additional materials such as fascia brackets and downspouts. A fascia bracket must be attached to every other rafter tail, which is approximately every 32 inches.

Mark the starting point of the gutter run 1.25 inches below the eaves flashing. This will ensure a secure and even installation. To determine the end-point of the gutter run, use a 1/2 inch downward slope, marking a line in chalk on the fascia every 10 feet, moving down 1/2 inch for every point.

Here's a quick checklist to help you get started:

Remember to keep detailed notes of all measurements and to consult the manufacturer's instructions for specific requirements.

Planning

Planning is a crucial step in preparing for a gutter installation. You'll want to start by looking around the house for the best places on the ground to route water.

Downspouts are usually placed at the end of a run or in an inside corner, but water from the roof shouldn't be discharged in a place where the ground will push water back towards the house. Consider the placement of splashblocks, diffusers, underground piping, and water collection barrels.

Tile Gutter and Pond
Credit: pexels.com, Tile Gutter and Pond

Before installing gutters, inspect the fascia board for rot or damage and repair it if necessary. This will ensure a solid foundation for your gutter system.

To ensure a smooth installation, make sure all surfaces are primed and painted with quality exterior paint. This will provide a durable and long-lasting finish for your gutters.

If you're planning to install gutters on a metal roof, you'll need to consider the unique requirements of this type of roof. Measuring the roof and purchasing the right materials are essential steps in this process.

Here's a rough guide to help you measure your roof and determine the number of materials you'll need:

Remember to mark the starting point of the gutter run 1.25 inches (3.2 cm) below the eaves flashing and determine the end-point using a 1/2 inch (1.3 cm) downward slope.

Mark Lines

Marking the lines for your gutter installation is a crucial step to ensure a smooth and even process.

Gutter on Building Wall
Credit: pexels.com, Gutter on Building Wall

Start by placing a level or other straightedge on the roof and letting it overhang the gutter area.

This will give you a clear reference point to work from.

The starting point for your gutter installation should be about 1 to 1-1/2 inches below this line.

Avoid installing the gutters directly against the underside of the shingles or other roofing.

If drip edge is present, the back of the gutter can slide behind it, but it's better for the gutter to go below it rather than on top of it.

To determine the slope of your gutter, use a chalk reel to snap a line that starts at a high point and falls about 1/4 inch per 10 feet of gutter run, towards the downspout locations.

Double-check that your lines fall toward the planned downspout locations using a level.

Mounting

Mounting your gutters requires some precision and the right tools. You'll need to cut the gutters to size using a hacksaw and heavy-duty tin snips.

Gutter on Sunlit Building Wall
Credit: pexels.com, Gutter on Sunlit Building Wall

To start, mark the point to be cut on the gutters with an erasable marker, and hold the handle with your dominant hand while keeping your index finger parallel to the top, pointing toward the cutting direction for support. Use the other hand to hold the frame at the top by the wingnut.

You'll also need to attach the gutter's fascia brackets to the rafter tails. Drill a 1/8 inch (0.32 cm) pilot hole through the fascia and into the rafter tails at each chalk mark, then attach the fascia brackets using 1/4 inch (0.64 cm) stainless steel lag screws at least 2 inches (5.1 cm) long.

To mount the gutters to the fascia brackets, lay your gutter into the fascia brackets and rotate it upward until the edge closest to the fascia fastens into the hook on the back of the bracket. Secure the gutters to the fascia brackets using machine screws, creating a 1/16 inch (0.48 cm) diameter hole into the front side of the gutter.

For every 2 foot (0.61 m) length along the gutter, attach it to the fascia using 1/4 inch (1.9 cm) stainless steel hex head sheet metal screws driven through the back side of the gutter into the fascia.

Cost

Photo of Roof While Raining
Credit: pexels.com, Photo of Roof While Raining

The cost of gutters and downspouts can add up, but it's essential to know what to expect.

Downspout costs can range from $3 to $5 per lineal foot, depending on the gauge, type of paint finish, and size.

A good estimate for additional downspout accessories is to double the cost of the downspout itself. This includes parts like downspout elbows, downspout straps, and downspout outlets.

Dark-green aluminum gutters can cost $2.75 per linear foot, materials only.

Cast-aluminum, closed-curl brackets can cost $8 each, and it's a good idea to spray-paint them to match your house trim.

White 4-inch-diameter corrugated aluminum downspouts can cost $1.75 per linear foot.

Tools and Materials

To install gutter downpipe, you'll need a variety of tools and materials. The minimum parts you'll need are listed below.

You'll need gutter sections, connectors, end caps, downspouts, inside and outside corners, hangers, elbows, downspout adapters, downspout extensions, splashblocks, piping or rain barrels, downspout brackets or straps, and fittings for any accessories.

Some of the tools you'll need include safety glasses, hearing protection, gloves, a pencil or marker, tape measure, chalk line, level, hacksaw or metal cutting tool, power drill or impact driver, drill bits, driver bits, pop rivet gun, hammer, pliers, metal snips, crimpers, and a ladder.

Things You'll Need

Credit: youtube.com, Starting Scenery: Basic Tools And Materials - What's in my tool box?

When working on a gutter installation project, it's essential to have the right tools and materials. You'll need gutters, which come in sections, and downspouts to direct water away from your home.

Gutters should be attached to the fascia and run the entire length of the roof, ending with a downspout. To determine the length of the gutter, use a measuring tape to measure the length of the roof. If the gutter run measures longer than 40 feet (12.2 m), it should be positioned to pitch down from the middle, aimed toward a downspout at each end.

You'll also need fascia brackets, which should be attached to every other rafter tail, approximately every 32 inches (81.3 cm). For example, if the roof length is 35 feet (10.7 m), you'll need to purchase 13 fascia brackets and at least 35 feet (10.7 m) of gutter.

Some other necessary materials include end caps, downspout adapters, and downspout extensions. You may also need downspout brackets or straps, fittings for any accessories, and seam sealant made for gutters.

Pigeon Perching on Rain Gutter
Credit: pexels.com, Pigeon Perching on Rain Gutter

Here's a list of the tools you'll need:

  • Safety glasses
  • Hearing protection if using power tools
  • Gloves
  • Pencil or marker
  • Tape measure
  • Chalk line
  • Level
  • Hacksaw or metal cutting tool like angle grinder with cutoff wheel
  • Power drill or impact driver
  • Drill bits
  • Driver bits
  • Pop rivet gun, if using rivets
  • Hammer
  • Pliers
  • Metal snips
  • Crimpers
  • Ladder

Don't forget to check your local building codes and regulations before starting your project.

Saw to Length

To saw your gutter to length, you'll want to cut it with a hacksaw and aviation snips, or a 12-inch power miter saw fitted with a carbide-tipped finish blade.

Cutting the gutter to the right length is crucial, so make sure to use the correct tool for the job. If you're using a 12-inch power miter saw, it's a good idea to use a carbide-tipped finish blade, as shown in the example.

If your gutter continues around a corner, you'll need to cut the appropriate angle on that end. Typically, this is a 45-degree angle.

To join two sections of gutter, overlap them by 8 inches and use a 3/8-inch-long, self-tapping, stainless steel screw or pop rivet in two rows of four each. Make sure to locate these screws or rivets in the sides of the gutter, never in the bottom.

Here are the specific tools you'll need for cutting and joining gutter sections:

  • Hacksaw and aviation snips
  • 12-inch power miter saw
  • Carbide-tipped finish blade
  • 3/8-inch-long, self-tapping, stainless steel screws or pop rivets

Straps

Gutters on Block of Flats Wall
Credit: pexels.com, Gutters on Block of Flats Wall

Straps are a crucial part of securing your downspout to the wall. They should be placed approximately every three feet.

You'll want to attach the straps to the wall using the appropriate screw for your wall condition. If you're connecting to metal siding, use metal-to-metal lap screws and attach the straps to the high seam of the wall panels.

Here are the types of screws you can use for different wall conditions:

Remember to attach the straps at regular intervals to ensure a secure hold.

Installation Steps

To install gutter downpipe, start by preparing the necessary tools and materials, such as a drill, ladder, and gutter downpipe sections.

Measure the length of your gutter and calculate how many downpipe sections you'll need, considering the recommended 3-meter spacing between downpipe sections.

Begin by attaching the downpipe to the gutter using the gutter clips, making sure they're securely fastened to prevent water from leaking out.

Next, connect the downpipe sections together using the downpipe connectors, ensuring a watertight seal to prevent water damage.

Remember to always follow the manufacturer's instructions for specific installation requirements and recommendations.

In 8 Steps

Credit: youtube.com, How To Install Step Flashings

Before you start installing gutters, make sure to check the fascia for rot and make repairs if necessary. This will ensure a solid foundation for your gutters.

Measure the length of your roof to determine how many gutters and downspouts you'll need.

Cut the gutters to the correct length using a hacksaw or a power saw. This will save you from having to trim them later.

Attach the downspouts to the gutters, making sure they're securely fastened. This will direct water away from your home's foundation.

Install gutter hangers to hold the gutters in place, spacing them about 2-3 feet apart. This will prevent sagging and ensure even water flow.

Secure the gutters to the house using screws or nails, making sure they're tightened firmly. Loose gutters can cause water to seep behind them.

Check the gutters for levelness and adjust as needed to ensure proper water flow.

Outlet and Caps Installation

Installing the outlet and caps is a crucial step in ensuring your gutter system is properly sealed and functioning.

A close-up shot of two Laughing Doves perched on a metal gutter with a blurred natural background.
Credit: pexels.com, A close-up shot of two Laughing Doves perched on a metal gutter with a blurred natural background.

Mark the location of the downspout outlet on your gutter, measuring from the corner of your home to the center of the outlet. Transfer this measurement to the gutter and mark the center of the outlet on the bottom side.

Use a chisel and hammer to create a V-shaped start hole, angling the chisel 45-degrees from the gutter and firmly hitting the end with a hammer. Be sure to cut 1/16 inch (0.16 cm) outside of the outlet line.

To attach the outlet, remove the outlet hole using offset tin snips, choosing green snips if cutting clockwise and red tin snips if cutting counterclockwise. Apply a bead of silicone gutter sealant around the perimeter of the opening before inserting the outlet.

Fasten the outlet with rivets, drilling 2 1/8 inch (0.32 cm) holes for the rivets. Then, remove the outlet and attach the rivets through the holes.

To connect the end cap(s) to the gutter, hold the cap in place and insert a single sheet-metal screw into its hole. While this temporarily holds the cap in place, drill another 1/8 inch (0.32 cm) diameter hole and attach a pop rivet into it.

Frequently Asked Questions

Does a gutter downpipe have to go into a drain?

No, a gutter downpipe should not be directed straight into an underground drain, as this can overload it. Instead, consider using surface water drains or soakaways to safely direct rainwater into the ground.

How do you secure a gutter downpipe?

To secure a gutter downpipe, a short pipe section is connected to the running outlet, which can be adjusted in length. A straight push-fit connection is then made to the first swan neck bend.

How deep to bury gutter downspouts?

Bury gutter downspouts at least 12 inches deep for optimal protection and efficient water drainage. This depth helps prevent damage from surface activities.

Amy Martin

Senior Writer

Amy Martin is a seasoned writer with over a decade of experience in various industries. She has a passion for creativity and enjoys exploring different perspectives on life. Amy's work often inspires readers to think outside the box and embrace new ideas.

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