Sealing the Skylights on a Flat Roof

1. The damage

The skylight base had crackedCrackA split or gap in render, concrete, a wall, a coating or wood. Fine cracks are usually only on the surface; ones that grow, keep reopening or run diagonally need attention. and pieces of the old material had come loose. Water gets in easily at spots like this.

2. Breaking out

Anything that had decayed around the base is broken out and removed, so we work on a sound surface.

3. First repair

The base is repaired and gets its first coat of waterproofingWaterproofingThe work and materials that stop water getting through on flat roofs, balconies, bathrooms, basements, planters and tanks..

4. Both skylights

The second skylight goes through the same process so no weak spot is left.

5. Waterproofing

The white coatingElastomeric waterproof coatingA thick, rubbery waterproof paint for flat roofs, parapets and roofs. It stretches without cracking as the building expands and bridges hairline cracks. covers the bases and runs out onto the roof around them, closing the joint with the floor.

6. The result

The bases are now continuous and sealed, with no cracks or open joints.