FAQ

It depends on your roof area, pitch and local rainfall. Our capacity calculator sizes the right profile and number of downpipes from a few measurements. As a rough guide, standard homes use 112mm Half Round; larger roofs and heavy-rainfall areas suit 120mm Deep Flow or Ogee; commercial buildings use Kommercial.

Look at the shape from the side: Half Round is a simple semicircle, Square Line is flat-fronted and box-shaped, Ogee has a decorative flat back with an S-curve front, and Deep Flow is a deeper half round. Our compatibility guide has photos of each. If unsure, take a clear side-on photo or bring a sample to a branch.

Sometimes. Half Round is the most widely cross-compatible and generally mixes with FloPlast, Hunter, Marley, Polypipe and others. Ogee and commercial profiles are far less interchangeable, and Krown Ogee and Krown Cast Iron Effect are Aquaflow-specific. Always confirm the exact profile before mixing parts — see the compatibility guide.

Most profiles are available in White, Black, Brown, Grey and Anthracite Grey. Anthracite is the most popular modern choice. Cast Iron Effect comes in a matt black finish that mimics traditional cast iron.

Space fascia brackets at 800–1000mm centres for Half Round, Square Line and Ogee, and 600–800mm for Deep Flow and Kommercial. Add an extra bracket within 150mm of every union, angle, running outlet and stop end. On very exposed or heavy-snow sites, reduce spacing further.

Lay the gutter to a slight fall of about 3mm per metre (1:350) towards the outlet. Fix the bracket at the high end first, then work down to the outlet. Leave the manufacturer's 6–10mm expansion gap at union joints.

No more than 1.8m apart, with a clip near the top and bottom of each run. Use an offset bend (swan neck) at the eaves to bring the downpipe back to the wall, and a shoe at the bottom.

Most leaks are at union joints. Check the rubber seal is clean and seated, that the gutter ends are within the expansion gap, and that brackets are supporting the joint within 150mm. Replacing the union or seal usually solves it. For sealant repairs, use a gutter-grade sealant from our sealants & adhesives range.

Standard delivery is £15 to England & Wales, free on orders over £150. Mainland Scotland is a flat £25. Click & Collect from any of our 21 branches is free with no minimum order. See the delivery page for full details.

Yes. Choose Click & Collect at the basket, pick your branch, and we'll email when it's ready. Collection is free with no minimum order. Find your nearest branch.

Yes — trade accounts get account pricing and credit support. Apply for a trade account.

Yes, within the terms of our returns policy. Order a little extra on brackets and unions for site cuts and breakages, then return unused, resaleable parts.