MG Building Supply is two businesses with one mission: we manufacture job-site problem-solvers like Flash Dam, Terra-Flash, and Curb Slope — and our MG Sales rep group helps commercial and residential building-envelope manufacturers grow market share across Washington, Oregon, Idaho, Montana, and Alaska — with MG-manufactured products also available in Canada.
We design and manufacture Flash Dam instant leak-control, Terra-Flash rapid soil stabilization, and Curb Slope ponding-water solutions — built by roofers, for roofers, and proven in real storm conditions.
See Our Products →A roofing manufacturers’ representative group — commercial and residential — with distributor relationships, contractor training, and job-site product support across the Pacific Northwest, Alaska, Montana, and Western Canada.
Meet the Rep Group →Every visitor has a different job to do. Pick yours.
Grow market share in the Northwest with a rep group that trains, stocks awareness, and supports your product on the roof.
Become a partner →Get product support, counter-day training, and fast job-site answers so your counter moves more product.
Distributor support →Find the right roofing and building-envelope solution — and get trained on it before the crew hits the deck.
Contractor resources →Product data, specs, and technical support for low-slope roofing and building-envelope design decisions.
Spec support →The instant temporary water dam that controls active roof leaks — even on wet surfaces, even in the rain. Pour, activate, repair.
Stop the leak →Rapid mud solidification. Broadcast across saturated ground and stabilize soil 2″ deep within about an hour.
Reclaim the site →A semi-self-leveling compound that slopes roofing curbs to the field of the roof — minimizing ponding water where it starts.
End the ponding →Counter days, lunch & learns, installation demos, and product comparison guides — because the line that gets trained on is the line that gets specified.
One call reaches both sides of MG Building Supply — manufacturing and the MG Sales rep group.
Contact Us Today