Waterproofing a Roof Channel and Upstands

1. The narrow ledge

Along the railings, a narrow strip of roof with old, worn concrete.

2. The water channel

A grey waterproofingWaterproofingThe work and materials that stop water getting through on flat roofs, balconies, bathrooms, basements, planters and tanks. layer goes into the channel that collects the water first, filling the cracksCrackA 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..

3. All the way along

The layer runs the whole length of the channel, right up to the outlet.

4. The outlet

Around the outlet the material is carried into the opening, so water drains away without finding a joint.

5. A white finish

A 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. goes on top, reflecting the sun and protecting the layer underneath.

6. Around the railings

The feet of the railings are covered carefully, because every fixing point is a possible leak.

7. The low walls

The coating runs up the low wallsParapetThe low wall around the edge of a flat roof or balcony. The joint between it and the floor is one of the most common places for leaks. and over their tops too.

8. The result

Channels, low walls and outlets all covered, with no open joints.