Better drainage
Tapered insulation adds slope so water runs to drains instead of ponding.
Roofing brands · Johns Manville
Johns Manville Flat Roof Systems in Venice, CA, Same-Day Quotes
Johns Manville, a Berkshire Hathaway company, makes complete flat roof systems, from insulation to the top membrane. We install JM TPO, modified bitumen and tapered insulation on homes and buildings across Venice, CA. Get a same-day quote, or call our 24 hour line for an emergency.
- TPO and mod bit
- Tapered insulation
- Homes and buildings
- Same-day quotes
About Johns Manville
Johns Manville: Whole Flat Roof Systems
Johns Manville has made building products for over 150 years. Its strength is the full flat roof system, not just the top layer.
- JM TPO single-ply membranes with heat-welded seams.
- DynaWeld and DynaLastic modified bitumen for torch-applied or cold-applied roofs.
- Polyiso insulation, including tapered boards that add slope for drainage.
- Built-up roofing products for older multi-ply roofs.
Getting insulation, cover board and membrane from one maker helps make sure every layer works together.
Product lines
Johns Manville Products We Use
These JM products cover most flat roofs we build with this brand.
| Product line | What it is | Best fit in Venice |
|---|---|---|
| JM TPO | White heat-welded single-ply membrane | Reflective flat roofs |
| DynaWeld | Torch-applied modified bitumen | Flat roofs with some foot traffic |
| DynaLastic | Modified bitumen for cold or hot application | Roofs where open flame is a concern |
| Tapered polyiso | Sloped insulation boards | Fixing ponding water on flat roofs |
| Cover boards | Protective layer under the membrane | Stronger, more durable flat roofs |
Johns Manville is a trademark of its owner. We are an independent roofing contractor and are not owned by or part of Johns Manville.
Why it works here
Why Johns Manville Works for Venice Flat Roofs
Many flat roofs fail because of poor drainage and weak layers below, not just the surface.
Cooler rooms below
Insulation plus a reflective top layer keeps heat out of rooms under flat roofs.
One matched system
Insulation, cover board and membrane from one maker work as a team.
Install and care
Fixing Ponding Water With a JM System
Water that sits on a flat roof shortens its life. A re-roof is the best time to fix it for good.
- We map low spots and drains before the old roof comes off.
- Tapered boards are laid out to move water toward each drain.
- Crickets push water around walls and rooftop units.
- Drains and scuppers are reset at the new roof height.
Learn more on our flat roof replacement page. Managing an apartment or office building? See our commercial roof service.
Explore more
Services, Brands and Areas Related to Johns Manville
Roofing services that use Johns Manville products, similar brands we install and nearby areas we serve.
Services using this brand
Similar brands we install
Areas we serve
Helpful roofing guides
Have more questions? Read our roofing tips and guides, learn about our team or send us a message.
Johns Manville questions
Johns Manville Roofing Questions Answered
What Venice homeowners ask us about Johns Manville products.
Who owns Johns Manville?
Johns Manville is a Berkshire Hathaway company. It has made building products for over 150 years.
What is Johns Manville DynaWeld?
DynaWeld is JM's torch-applied modified bitumen line, used on flat roofs that need a tough, multi-layer surface.
Can tapered insulation really stop ponding?
Yes. Tapered boards add slope under the new roof so water flows to drains instead of sitting for days.
Is Johns Manville only for commercial roofs?
No. JM systems are common on commercial buildings, but we use them on flat home roofs and additions too.
Johns Manville installs
Get a Quote on a Johns Manville Flat Roof
We will check drainage and insulation on your flat roof and give you a clear written price for a full JM system.