Why low-slope roofs behave differently here
On a steep shingle roof, gravity does most of the work. A flat or low-slope deck does not get that help, which is why the assembly underneath matters far more. Out along Hwy 2 west of Spokane, the agricultural shops, additions, and commercial buildings around Reardan tend to carry large flat spans, and every one of them lives or dies by its drainage path and seam integrity.
Water that sits even a quarter inch deep will find the smallest gap in a lap or a flashing termination. We design these roofs around positive drainage first, then choose a membrane and detailing that can take standing water without failing.
TPO membrane for the prairie climate
TPO (thermoplastic polyolefin) is our workhorse single-ply for Reardan low-slope work. The seams are hot-air welded into one continuous sheet, so there are no adhesives to dry out and peel in the freeze-thaw cycles common across Lincoln County wheat country. A welded lap is effectively as strong as the membrane itself.
- Reflective white surface that sheds summer heat off shop roofs and outbuildings
- Heat-welded seams that resist the lifting forces of wind-driven rain
- Reinforced scrim that holds up to hail and foot traffic during maintenance
For some assemblies we also spec mechanically fastened or fully adhered systems depending on deck type and exposure. The right fastening pattern is what keeps a membrane down when gusts come across the fields.
Wind uplift on open ground
There are no tree lines or hills to slow the wind here. The open wind exposure around Reardan means a flat roof faces uplift pressure that a sheltered town roof never sees, and the corners and perimeter take the worst of it. A membrane that is under-fastened at the edges will balloon and tear long before the field of the roof gives out.
We increase fastener density at perimeters and corners, lock down edge metal with proper cleats, and weld perimeter bars where the system calls for it. The goal is a roof that treats a hard gust as a non-event.
Snow, ice, and ponding
Flat roofs hold snow rather than shedding it, so the load and the slow melt both become design problems. As snow melts and refreezes near drains and scuppers, ice can block the outflow and back water up across the field. On a low-slope roof that backup has nowhere to go.
We confirm the deck has enough slope to drain, add tapered insulation where it does not, and detail drains, scuppers, and overflows so meltwater leaves the roof before it can pond and freeze. Where a roof already ponds, a re-cover with tapered insulation often solves the underlying problem rather than just patching the symptom.
Repair, re-cover, or replace
Not every tired flat roof needs a tear-off. If the deck and insulation are sound and the membrane is simply worn, a TPO re-cover over the existing system can be the smart call. If there is trapped moisture in the insulation or the deck is compromised, a full replacement is the only honest fix.
We open the roof, check the insulation for saturation, and tell you which path you are actually looking at. You can compare your options against our full roof replacement services to see where a low-slope project fits in the bigger picture.
Working with DG Contracting
DG Contracting LLC has served the Inland Northwest since 2013, and we hold GAF Master Elite status held by only the top 2 to 3 percent of roofers nationwide. Our work is backed by a 15-25 year workmanship warranty, and we carry licensing and insurance in both Washington and Idaho.
- Free, no-pressure estimates on flat and TPO projects
- Flexible financing for larger commercial and agricultural roofs
- 5.0 rating across 303 Google reviews
Call (509) 209-1894 to schedule a look at your low-slope roof.
