Render, gutters and the roofline: what goes first

The usual order

In most re-rendering jobs, roofline work comes first. New fascias, soffits and gutters are fitted, so that the line the render must meet is final and water from the roof is going where it should. The render then goes on below, finishing neatly under the soffit or eaves board. Downpipes are taken off before rendering and refitted afterwards, ideally once the finish has cured.

Doing it the other way round risks damage. Fitting new fascias after rendering can crack the top edge of the render, and gutter brackets fixed over new render can leave holes and splits. If the gutters are not replaced, they should at least be cleared and repaired before the render, so the new wall is not soaked from above.

Commercial & new build ↗

Forming the top edge

The render should stop cleanly just below the soffit or eaves board, on a bead where the detail needs one, rather than being packed into the joint. Render packed into the eaves can hold water, crack with the timber's movement and stain the soffit. On a gable, the render meets the verge, and the same care applies.

Where the roof overhang is short, the top of the wall gets wet in every rain, so the top edge needs to be well formed and the gutter must not overflow onto it.

Downpipes during and after

Downpipes are removed before rendering. In between, rainwater still has to go somewhere, so a temporary pipe or flexible hose leading away from the wall stops the gutter pouring onto bare brick or fresh render. When the pipes go back, they need brackets long enough for the new render and fixed into the masonry, not just the render, with each fixing sealed.

A pipe should stand slightly off the finished wall and discharge into a gully or drain, not onto paving against the wall. In a low-lying city where the council's flood strategy notes surface water pooling in low spots, keeping roof water away from the foot of the wall matters.

When insulation is involved

External wall insulation changes the sequence. The wall face moves outwards by the thickness of the system, so the roof overhang may no longer cover the top of the insulation, and gutters may need to sit further out. Extending the eaves or verge is roofing work and has to be designed before the boards go on. In Garden Village, Hull City Council's Article 4 directions require planning permission for any alteration to the roof of a house, so extending the eaves there needs checking first.

Downpipes on an insulated wall need stand-off brackets fixed through the insulation into the masonry. JUB's installation overview for its system says fittings should be removed and their refitting planned before boarding starts.

What goes wrong when the order slips

Most problems at the roofline come from doing things in the wrong order or skipping a step. Gutters left leaking while the wall is rendered stain and soften the new finish before it has cured. Fascia boards replaced after rendering crack the top edge of the render as the old boards are prised off. Gutter brackets or satellite dishes screwed into fresh render leave cracks round their fixings. And downpipes put back on the old short brackets, now buried in thicker render, pull loose within a season.

At the other end of the wall, the render should stop on a bell-cast bead above the damp-proof course. Catnic describes its bell-cast bead for use at DPC level so rainwater drips clear of the masonry below. A wall that is well finished at the top but runs down into the paving at the bottom still gets wet.

Sharing the scaffold

One scaffold can often serve the roofline trade and the renderer, which saves putting it up twice. The order has to be agreed: roofline first from the top lift, then the render working down, then downpipes and fittings, then the scaffold comes down. Each trade should know what the other is doing, so a new fascia is not damaged by render splashes and fresh render is not knocked by roofline work.

Agree who is responsible for sheeting and protection at each stage, and who checks the junction between the new roofline and the top of the render before the scaffold goes. If the weather holds up one trade, the other may need to wait; a renderer working under a half-finished roofline risks the same water damage the sequence is meant to prevent. A short written order of work, pinned up where both trades can see it, keeps everyone on the same plan.

A worked example

Take a hypothetical semi with rotten timber fascias, leaking gutters and hollow render on the gable and rear. The roofline contractor fits new fascias, soffits and gutters from the scaffold first. A temporary hose takes roof water away from the wall. The renderer then hacks off the gable and rear, repairs the brick, fixes beads including a bell-cast bead above the DPC, and renders up to a neat stop under the new soffit. Once the finish has cured, the downpipes go back on longer brackets into the brick. The example is illustrative.

Finishing and records

Before the scaffold comes down, check the top edge of the render under the soffit, the gutter falls and joints, and each downpipe bracket. Run a hose into the gutter if there has been no rain, and watch where the water goes. Keep the product details for the render and the roofline together; if a stain appears later, it helps to know whether it starts at the gutter or in the render. The Hull rendering homepage covers other kinds of rendering work.

For commercial premises, the same sequence applies with more trades: signage, lighting and alarm boxes near the roofline should be scheduled between the roofline and render stages so nothing is fixed over fresh render.