Is Roof Doctor NM Johns Manville certified?

No — we've attended in-person Johns Manville product-knowledge training (Denver, CO regional), but Johns Manville generally does not issue individual "certified" credentials for product training. We list this as training attended, never as certification. That distinction matters and we keep it strict.

What do you look for on a Johns Manville install?

We check the finished roof against Johns Manville's published install spec — nailing pattern, flashings, underlayment, accessories, and warranty registration paperwork. APP and SBS mod-bit torch/cold-adhered systems, JM TPO Peel & Stick

Should I hire a Johns Manville-authorized contractor?

For system warranty coverage (like GAF Golden Pledge or Owens Corning Platinum), yes — only manufacturer-authorized installers can register those warranties. For the roof itself, install quality matters more than the badge. We'll tell you honestly whether the bid you have satisfies the Johns Manville warranty requirements.

Manufacturer notes

Johns Manville

Modified bitumen & TPO — inspector's-eye notes on install spec, warranty requirements, and what typically gets skipped on NM installs.

Training attended

APP and SBS mod-bit torch/cold-adhered systems, JM TPO Peel & Stick

Denver, CO regional

Owner-attested attendance. Johns Manville does not typically issue individual certificates for product-knowledge sessions. Listed as training attended, never as certification.

What we check on a Johns Manville install

Membrane thickness (mil) — 60-mil is the honest minimum for NM UV exposure.
Seam quality — heat-welded seams should be probed at completion, not just eyeballed.
Insulation R-value and taper — ponding water voids most single-ply warranties.
Termination bar and coping cap detail at parapets — where wind gets under the field.
Fully-adhered vs mechanically-attached — matters for wind ratings and puncture risk.

Questions to ask any contractor bidding Johns Manville on your roof

Are you a Johns Manville-authorized installer? Can you register the manufacturer's system warranty on my roof?
Which Johns Manville product line are you installing? What's the exact spec — nailing pattern, underlayment, accessories?
Will you supply photos of critical details (valleys, penetrations, flashings) before dry-in and after tear-off?
Does the Johns Manville warranty on this bid cover material only, labor + material, or full system with workmanship?
What's your written policy if a Johns Manville warranty claim is denied later because install spec wasn't met?