Roof education / Modified bitumen
Modified bitumen remains on existing commercial buildings. Single-ply roofing has largely replaced it, but an existing roof deserves a condition-based decision.
Request a BidModified bitumen is an asphalt-based roofing material, generally installed as part of a layered assembly. Age alone does not establish the cause of a leak or the right repair.
Look at seams, flashings, drainage and the condition of the underlying assembly before defining the work.
Dior Construction provides modified bitumen repairs and replacement. An assessment should address where water is entering, the extent of deterioration and whether the roof assembly contains moisture.
When replacement is appropriate, compare the available single-ply systems against your building conditions and project requirements.
Further reading
Built-up roofing is an older asphaltic low-slope system assembled from multiple layers. Understanding those layers helps owners distinguish a commercial roof assembly from the loose labels tar and gravel or rolled roofing.
Read the guidePublished modified bitumen prices vary because the sources describe different scopes and use different estimating assumptions. Treat those ranges as background for planning, then assess the actual roof before requesting a project bid.
Read the guideAn aging asphaltic roof deserves diagnosis before a repair product or replacement system is selected. Dior Construction helps property teams evaluate the visible problem, moisture beneath the surface and the scope needed to address both.
Read the guideModified bitumen uses asphaltic sheets in a multilayer system, while TPO uses a thermoplastic single-ply membrane with hot-air-welded seams. The decision should follow the roof condition, building use and complete proposed assembly.
Read the guideSBS and APP are different ways of modifying asphalt for roofing sheets. The distinction matters for flexibility, application and repair, but neither label replaces a complete assessment of the building and roof assembly.
Read the guideTorch down describes an application method used with certain modified bitumen roofing sheets. It is an older asphaltic approach that still has a role, but owners should compare its installation constraints with modern single-ply alternatives.
Read the guideNext step / Start a conversation
Tell us about your building, the work you are considering and your priorities. A clear scope starts here.
For an active leak, call our team.
(201) 472-5462