Flat roof repairs

Take care to supply an appropriate, safe means of access to any roof. Remember also, to require care when working near the sides of the roof. If you’ve got any doubts a few safe means of access, consult knowledgeable. confirm that the roof structure itself is sound and capable of supporting your weight

Roof condition

Examine the general condition of the flat roof covering. If it’s deteriorated significantly over an outsized a part of the entire, consider getting a quote for its replacement. Whilst repairs on a serviceable covering are sensible, because it gets towards the top of its useful life, repairing could also be uneconomic.

Finding the leak

The first problem can often be locating the source of the fault. you’ll rather be ready to see where water is seeping through into the ceiling below, but the purpose at which the water is getting into might not be immediately above.

Damp penetration

Where dampness appears at the ceiling edges, the standard cause may be a defective flashing – the sealing strip at the sides.

To find the source, identify the corresponding position on the roof above the damp area. Flat roofs have a small slope, therefore the source must either be here or uphill from now. Examine the surface for cracks, splits or blisters.

If the roof is roofed with chippings, sweep these away to enable closer examination. Where the chippings are stuck within the bitumen, apply light heat with a hot air stripper to melt the bitumen and release the chips.

If there are splits, these could also be caused by movement within the roof structure, usually as a result of expansion and contraction under the warmth of the sun.


Blisters could also be caused by moisture penetration, or trapped air. they will be squeezed lightly to ascertain if they need any weakness. If they’re sound, they’re probably best left alone instead of creating more problems.

Patching kits

Various kits containing special tape and adhesive are available for completing patch repairs. These should obviously be administered in dry weather.

Clean the world thoroughly removing chippings and killing off any mould growth with fungicide.


If the surface is split, fill the gap with bitumen compound before patching.

If you’ve got a burst blister, dry it out first with a hot air stripper. within the case of asphalt, you’ll be ready to fill within the hole by spreading the nice and cosy asphalt with a stripping knife.

Allow to chill, then prime the surface of the world to be repaired with the special primer supplied.

Cut the tape to length and press firmly down into place.

Make sure the sides are well sealed.

When complete, recover with chippings as before or ‘blind’ with sand to guard the surface.

Felt covered roofs

In the case of felt, carefully make a crosscut within the surface and lift up the flaps to dry it out. Apply bitumen adhesive to the opening before folding back the flaps and pressing down into the adhesive.

This area should then be further protected by coating with the bitumen adhesive and patching with a square of roofing felt a touch larger than the damaged area. once more, confirm this is often firmly pressed down and well-sealed at the sides.

Whole surface treatment

If you’ve got several repairs looking somewhat unsightly and there are signs that further deterioration is imminent, it’s going to be rejuvenated by treating the entire surface

Brush off all loose material and treat the surface with fungicide to exterminate any mould growth.

Once cleaned and allowed to dry, apply liquid bitumen – purpose designed for the work. Plan your work pattern to avoid being ‘boxed’ in by the wet bitumen. Use an old broom to spread this because it is going to be a thankless task to undertake cleaning it out afterwards.

To provide additional strength, lay optical fibre matting. this is often pushed down into the bitumen before it dries and will be tamped down in order that it’s thoroughly coated. to make sure continuity of strength, overlap the optical fibre joins by a few of inches.

Allow to dry consistent with the manufacturer’s instructions before applying a second coat of the liquid bitumen. When this is often dry, apply a 3rd and final coat but ‘blind’ this with sharp sand before it’s fully dried. Spread the sand lightly employing a seed sowing action.