Quick answers
How do you insulate narrow rooftop passages around the stairhouse where water tends to pool?
In tight passages between the stairhouse wall, parapets, railings and solar heaters where sheet membranes are awkward to lay, bitumen primer and sprayed polyurethane foam coat the floor and turn up the walls in one seamless layer.
On many apartment building roofs, narrow passages form between the stairhouse or lift room walls, the perimeter parapets, railings and solar water heaters. Rainwater easily gets trapped in those tight corridors, and laying rolls of torch-on membrane around so many corners and obstacles is difficult.
On this roof with tight walkways, all the narrow corridors and the areas beneath the solar heaters were cleaned and coated with black bitumen primer.
Polyurethane foam was then sprayed across the passages, reaching into every tight corner, turning up the parapet and stairhouse walls and sealing seamlessly around solar heater and AC bases, finished with a white protective UV coat.
Jobs that show it
Spray Foam Insulation on a Roof with Narrow Walkways
A roof with solar water heaters, railings and narrow passages around the rooftop room. Primer and polyurethane foam reached every corner.
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Roof Insulated with Spray Polyurethane Foam
The roof was covered with one continuous layer of polyurethane foam that runs up the walls and around the bases of the air conditioning units.
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Bare Roof Sprayed with Foam and Coated White
A bare concrete roof, low walls included, was covered with a continuous layer of polyurethane foam and then a white protective coating.
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