How to Replace Guttering: A Step-by-Step Guide to Guttering Replacement

If your gutters are cracked, leaking, or no longer draining properly, it may be time to consider a full guttering replacement. Replacing your old system with modern plastic guttering is one of the most effective home improvement projects you can take on, especially if you’re comfortable with a bit of DIY. Not only will it protect your property from water damage, but it will also improve your home’s appearance and efficiency.

In this guide, we’ll walk you through the process of removing old gutters and installing new ones. We’ll also highlight essential safety precautions, explain the role of each component (from the gutter downpipe to the gutter fixings), and share practical tips for a successful installation.

Safety First: Preparing for Guttering Replacement

Working at height always carries risks, so safety should be your top priority before you even touch your gutters.

• Position your ladder correctly: Place the base a quarter of the ladder’s height away from your wall. Ensure it’s stable and on solid ground.

• Use an extension ladder safely: Overlap at least three rungs for extra stability.

• Always have a helper: Ask someone to hold the ladder while you climb.

• Stay balanced: Keep your belt buckle between the ladder’s rungs and wear non-slip shoes or boots.

• Avoid overreaching: Move the ladder instead of stretching beyond arm’s length.

• Consider scaffolding: It’s safer than ladders for extensive guttering work.

Understanding the Guttering System

Before starting, it helps to know the main components of a guttering system and how they work together:

• Gutter lengths: These channel rainwater from your roof. Some sections have a socket end that connects to the next spigot end, while others use a union piece with gaskets for a watertight seal.

• Downpipe: The vertical pipe that directs water from the guttering to the ground-level drain. Offset bends are used if your roof eaves overhang.

• Outlets: A stop-end outlet connects at the end of a gutter run, while a running outlet can be placed mid-way. Both lead into the downpipe.

• Hopper head: Sometimes used to collect water from multiple sources, though they’re less common in modern systems.

• Gutter fixings: Brackets, clips, and unions that secure everything in place. These are crucial for a long-lasting, stable installation.

Removing Old Guttering

Replacing guttering starts with safely taking down the old system.

Step 1: Remove the fixings

• Hammer nails into the fascia beneath the gutter to temporarily hold it in place.

• Cut through any bolts with a hacksaw, then knock them out with a punch and hammer.

Step 2: Take down the gutters

• Tie ropes to each end of the guttering section you’re removing.

• Detach the gutter joints and unscrew the brackets.

• Lower the gutter carefully to the ground using the ropes.

• Remove the downpipes section by section, starting from the top. Use pincers or a crowbar to remove old pipe nails.

Once the old system is down, check the fascia board for damage. Fill in screw holes, sand back flaking paint, and re-stain or repaint before fitting your new gutters.

Fitting New Gutters

Modern plastic gutters are designed for quick installation, but following the correct order is essential for a watertight finish.

Step 1: Install the gutter bracket

• Start by fitting the first bracket near the top of the fascia, opposite your outlet.

• Tie a builder’s line to the bracket to mark the slope of your guttering.

Step 2: Fit the outlet

• Hold a plumb line above the drain and mark the fascia.

• Fit the outlet about 50mm below the roof tiles.

Step 3: Install the remaining brackets

• Ensure the string line slopes gently (about 10mm every 6m).

• Space brackets no more than 800mm apart (600mm for steep roofs) and within 150mm of any joint.

Step 4: Fit the gutter lengths

• Start with a stop-end piece. Clip the gutter into the bracket, tilting it under the back clip first.

• Add union pieces at joins and ensure all sections align with the manufacturer’s depth marks to allow for expansion.

• Cut the final section to size, attach a stop-end, and clip it into place.

Pro Tip: Plastic gutters expand in heat and contract in cold. Always leave expansion gaps as marked on the fittings.

How to Fit a Downpipe

The downpipe is essential for guiding water away from your walls and foundations.

Step 1: Mark the clip positions

• Use a plumb line to draw a vertical line from your outlet to the drain.

• Mark clip positions along the line, no more than 1.8m apart.

Step 2: Drill and plug

• Drill the fixing holes to the manufacturer’s recommended size.

• Insert wall plugs for secure fixings.

Step 3: Install the downpipe

• Start with the socket at the top, leaving a 10mm expansion gap.

• Secure each section with clips and continue down to ground level.

Step 4: Fit the shoe

• Attach a shoe at the bottom so water flows directly into your drain.

• Secure the join with a clip.

Final Thoughts on Guttering Replacement

A well-installed guttering system is vital for protecting your home against water damage. With the right preparation, tools, and safety measures, replacing your gutters can be a straightforward home improvement project that saves you money and enhances your property.

From securely fitting your gutter fixings to aligning your gutter downpipe correctly, every step contributes to a durable and efficient drainage solution. Whether you’re replacing cracked plastic gutters or upgrading from heavy cast iron, taking the time to do the job properly will ensure your home stays dry and protected for years to come.