Why Is A Commercial Roof Flat?

flat commercial roofWhy are commercial roofs typically flat while residentials roofs are sloped? What is the reason behind such construction? We’ll explain the purpose for a flat commercial roof, which is the norm for public buildings across Seattle, and elsewhere.

The Reason for Flat Commercial Roofs

Actually, commercial roofs aren’t completely flat. They are sloped, but just very slightly at 2%, just enough to prevent water from ponding. Nevertheless, they’re flat in comparison to residential roofs. Why is this?

The reason comes down to both cost and practicality. A flat roof has a lower total surface area than a sloped roof. The former requires less material and framing.

Plus, if you think about it, a sloped roof on a school, hospital, or warehouse would look out of place. We also think sloped roofs have a homely vibe that is best reserved for living units.

Why Sloped Commercial Roofs Are Not Feasible

Aside from the cost factor, sloped commercial roofs just aren’t practical. Since commercial facilities are a lot larger than residential homes, a sloped roof would have a very high peak. This runs the risk of exceeding building height limits. You can offset this by incorporating multiple valleys in the construction. However, this would add to the design complexity and increase installation cost dramatically.

Another factor is the space. Commercial buildings require a flat roof surface in order to accommodate equipment, such as bulky HVAC systems. Building codes usually do not permit outdoor ground installation since it poses a safety hazard. It also creates tampering risk. Installing the system indoors would consume valuable space.

We Install Commercial Flat Roofs

Call Roofing and Construction for commercial roof installation or upkeep. We also have additional services for fortifying your existing roof. A flat commercial roof is efficient and cost-effective; why fix what isn’t broken?

Flat Roof Installation for Seattle Facilities

Serving customers in Bellevue, Issaquah, Mercer Island, Mill Creek, Mukilteo, Redmond, Snoqualmie