Flat Roofing

Flat roofs are most often used to maximize useable space, such as on row homes in cities like Washington DC. TPO, once welded together, creates a seamless watertight membrane which is especially important on a roof without no or low slope.

Common Questions

Is a permit required to install a flat roof in DC?

Yes, a permit is required for installing a flat roof in DC. We take care of obtaining permits for all of our flat roofing jobs in DC.

What warranty and financing do you offer?

Our TPO roof installations come with a 20yr warranty backed by MuleHide. View warranties

Our partnership with EnerBank USA lets us offer our clients no money down financing as low as $99 per month. View financing

How long does it take to get my flat roof?

After an in-home visit where the project quote is accepted and permit approval, most TPO flat roofs are installed within 1-2 weeks, with the installation process generally taking 1-2 days. .

Finished TPO flat roof in Washington, DC.
Flat Roofing in Washington, DC. TPO Roofing DC.
Roofing in Washington, DC.
Details of TPO flat roofing installation.
Residential TPO flat roof in Washington, DC.
Finished photo of a TPO flat roof.

TPO Flat Roof Layers

Wood Deck

All roof layers are stripped to reveal the wood deck, which is thoroughly inspected and replaced.

Poly ISO Insulation

Polyisocyanurate insulation board goes down as a base layer. ISO board is a high density insulation board. Total R-Value is dependent on the amount of insulation installed. Learn more about insulation >

R-value Upgrade

R-value represents an insulation's effectiveness at resisting heat travel. Upgrades include more poly-ISO, staggered seams, and longer fasteners. We offer 5 options, from R6 up to R30.


Fasteners securely hold down the poly-ISO, protecting against wind uplift.

TPO Membrane with Adhesive

Standard size .60mil TPO membrane is glued and the seams are overlapped.

Welded Seams

A machine welder is rolled over seams, melting them together create one continual seamless surface.

Components of a TPO roofing install. A photo showing how TPO white roofing reflects the sun to keep temperatures cooler on the roof.
Training video of flat roofing from MuleHide.

30+ Years’ Experience

Thousands of satisfied home owners across Maryland and DC.

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Lifetime Warranties

Highly certified with Atlas, GAF, Mastic, James Hardie & more.

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Value Focused

A family team proud to deliver excellence at a fair price.

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Trusted by local homeowners.

My husband and I met with Pat Jewell and he was such a pleasure to work with. Very knowledgeable and kind. We felt comfortable with this company.
We are very pleased with the work that Capitol Improvements did and we would highly recommend and use them again in the future.
Carlos, Yelp Reviews
They had the most competitive prices and did not try and upsell. Their teams are efficient, professional, very clean, and on time.
Veronica, Google Reviews
Seth and install team were organized and project went smoothly. Entire team was responsive and kept in touch throughout the process.
They replaced my roof including skylights in April 2023 and I am very satisfied. Melinda as my first contact was very professional and got me on the schedule quickly.
It was easy to work with Pat to get a quote. We did both a roof on our house and our shed, we also had new gutters put on our den. The crew was very hardworking and efficient.
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