Low-slope and flat roof repair for Bagley Downs homes, Vancouver, WA 98661

The typical Bagley Downs addition sits at the back or side of the house with a pitch of one or two inches per foot, sometimes less. Some were covered with rolled roofing that has cracked and blistered. Others got shingles, which leak because water moves too slowly to clear the laps. Many have no cricket where they meet the house, so water pools at the wall. The flashing there may be a single strip of metal under the siding. We often find rotted plywood along that wall and around any skylights cut into the addition.

For these sections, we tear off the old surface, replace soft decking and install a proper low-slope system. Torch-down modified bitumen and single-ply membranes both work well here. Where the main roof flows onto the addition, we add a cricket or diverter so water is steered off cleanly. Edge metal, scuppers and gutter outlets are sized so a heavy rain clears quickly instead of backing up. On additions with a skylight, we raise the curb above the new surface so water never sits against the frame.

A low roof in Vancouver lives with standing water from October through May. Long rains leave shallow ponds that take days to dry. Leaves from nearby trees collect in those ponds and decay, holding moisture against the surface and blocking drains. When temperatures drop, any water trapped in a crack can expand and open it wider. Summer sun then bakes dark membranes and dries out older rolled roofing. A low-slope roof here needs a surface that can handle months of wet, plus drainage that actually moves water to the edge.

We start by checking the pitch, drainage and decking. A torch-down replacement on a 300 square foot addition often runs $3,840 to $7,620. A reflective roof coating on a sound low-slope surface may land between $1,280 and $3,170. These are typical ranges, and we confirm your price after inspecting the roof. Where the main shingle roof is near the end, we plan both together so the transition between the low and steep sections is built once, with one crew and one set of flashing details.