Owner
- EPDM stays pliable in deep cold, so laps and flashings move with the deck instead of cracking.
- A downtown roof behind parapets can often go down in one or two sheets, with few field seams to maintain.
Rubber Membrane Roofs
Flagstaff EPDM Roofing Contractor
We install, replace, and repair EPDM rubber roofs on Flagstaff buildings. As an EPDM roofing contractor, we work on taped seams, pipe flashings, and aged membrane.
- Seam methodSeam tape and cover strips
- Typical lifeAbout 25 to 30 years
- Cold weatherStays flexible in deep cold
- First stepSeam and moisture inspection
Is It A Fit
Is This Roof A Fit For EPDM?
EPDM suits roofs that see hard freezes and light foot traffic. These are the lines we use on Flagstaff buildings.
Good Fit
- Roofs crowded with pipes, vents, and small curbs
- Downtown masonry roofs behind parapets with tight access
- Existing EPDM roofs with a dry deck and insulation
- Buildings where black EPDM's winter sun gain helps clear snow
- Low-traffic roofs with few rooftop units
Better Served By Another System
- Roofs with heavy service traffic to many units
- Buildings with big summer cooling loads that want a white surface
- Pitched sections that need to shed snow
- Owners who want heat-welded seams
Leak Signs
Where EPDM Roofs Start To Leak
Aged EPDM tells on itself at seams, pipe flashings, and edges. The inside signs below lead us to each one.
Inside
Drips After A Cold Snap
Water appears a day or two after a hard freeze, then stops once the weather warms.
On the roof
Seam Adhesive Letting Go
Older seams glued with adhesive open in deep cold. We clean back the lap and rebuild it with seam tape and a cover strip.
Inside
A Ring Below A Vent Pipe
A small brown ring sits right under a plumbing vent or pipe through the roof.
On the roof
Cracked Pipe Boot
The rubber boot around a pipe splits as it ages in the sun. A new pre-molded boot or field flashing seals the penetration.
Inside
Flapping Noise In Storms
Occupants hear rumbling or flapping overhead during windy afternoons.
On the roof
Edge Uplift
Wind gets under a loose edge and lifts the membrane. New edge metal and a fastened termination hold the perimeter down.
Inside
Drops From A Light Fixture
Drops fall from a light fixture or sprinkler head after water travels along the deck.
On the roof
Puncture Over Wet Boards
A small puncture lets water soak the insulation around it. We cut out the wet area, replace the boards, and patch with cover tape.
Inside
Frost Along A Parapet
Frost or damp spots form inside along the top of a parapet wall in winter.
On the roof
Membrane Shrinking At The Wall
Aged EPDM shrinks and pulls away from the base of walls, bridging the corner. Relieving the tension and reflashing the wall closes the gap.
Your Options
EPDM Options For Flagstaff Buildings
EPDM work runs from rebuilding one lap to replacing the whole roof. The seams and the insulation set which one fits.
| Option | What it involves | When it fits |
|---|---|---|
| Seam and flashing repair | Cleaned laps rebuilt with seam tape, new pipe boots, cover strips | The membrane is still flexible and the insulation is dry |
| Recover with new EPDM | New insulation and EPDM installed over the existing roof | The old roof is dry, the code allows another layer, and the snow load allows the weight |
| Tear-off and replace | Old roof removed to the deck, wet boards replaced, new EPDM | Seams fail across the roof or wet insulation is widespread |
| White EPDM | A light-colored EPDM sheet in place of black | Cooling loads matter more than winter sun gain |
Who Gains
Why Choose EPDM In Flagstaff
EPDM rubber stays workable through the freezes that crack other materials. Here is who gains on the right building.
Facility Manager
- Cover-tape patches bond to clean EPDM, so a puncture near a pipe becomes a short repair.
- Pre-molded boots and cover tape seal roofs crowded with pipes and vents, with no welding gear on the roof.
Tenants And Staff
- Black EPDM absorbs winter sun, which can help snow clear sooner on some roofs over occupied rooms.
- Seams rebuilt with tape and cover strips stop the cold-snap drips that show up a day after a hard freeze.
Roof Trouble
Seams Opening After A Freeze?
Call and tell us when the leak shows up and how old the roof is. Cold-weather seam failures on EPDM follow a pattern we can trace.
How The Work Runs
How We Rebuild An EPDM Roof In Flagstaff
EPDM work happens in dry stretches, with each section taped and flashed before the end of the day.
Inspect Your Roof
We pull back test laps, check every pipe boot and edge, and run moisture readings. That tells us whether the seams or the whole membrane have reached the end of their life.
Remove Or Prepare The Old Roof
Wet boards come out and the deck gets repaired, or a dry roof is cleaned and prepared for a recover.
Lay And Tape The Sheets
Large sheets are adhered or fastened, and laps get primer, seam tape, and a rolled finish. Cover strips go over fastener rows at the edges.
Flash Pipes, Walls, And Edges
Pre-molded boots, wall flashings, and fastened edge metal finish the roof. Together we walk it and check each seam before closing out.
Roof Systems
Systems To Compare With EPDM
Two other systems come up when EPDM is a close call on a Flagstaff roof.
TPO Roofing
Buildings with heavy rooftop service or big summer cooling loads tend to do better with white TPO and welded laps.
Industrial Roofing
Plants with exhaust, equipment, and daily traffic need reinforced membrane and walkway layouts planned before install.
Common Questions
EPDM Roof Questions
Answers for owners with an aging rubber roof or a choice to make between EPDM and another system.
When does EPDM make more sense than TPO in a cold mountain climate?
When the roof sees many hard freezes and little foot traffic. EPDM stays flexible in deep cold, and black EPDM soaks up winter sun, which can help snow clear sooner on some roofs.
TPO tends to win where summer cooling costs dominate or heat-welded seams are wanted. We compare the existing assembly, deck type, drainage, and how the building is heated before recommending either one.
Can old EPDM be repaired, or does it all need replacing?
Old EPDM can often be repaired if the rubber is still flexible. Supple membrane takes new seam tape and patches well.
Brittle, cracked, or badly shrunken membrane, or wet insulation across large areas, points to replacement. A fold test on a sample from the roof edge tells us which one we are dealing with.
Why do EPDM seams fail in winter?
Older EPDM seams were glued with liquid adhesive, which weakens with age and lets go when cold stiffens the lap.
Rebuilding those laps with seam tape and cover strips gives a stronger bond than the original adhesive, and it holds through the freeze-thaw cycles here.
Can EPDM go over a metal deck?
Yes, over insulation boards fastened to the deck. The boards give the membrane a flat, firm base and add the insulation that limits melt and refreeze.
The fastening pattern is set heavier at the roof edges and corners, where wind pulls hardest.
Does EPDM need a protective coating?
Usually no. EPDM resists UV on its own.
When a reflective roof is the goal, a white EPDM sheet is the cleaner route, since coatings on rubber need periodic renewal and add another layer to maintain.
What causes EPDM to shrink?
Age and sun. As the rubber loses its oils it shrinks and pulls at walls, curbs, and edges, bridging the inside corners.
Relieving that tension and adding new flashings fixes it while the open field of the membrane still has life left.
How are pipe penetrations sealed on EPDM?
With pre-molded pipe boots where they fit, and field-fabricated flashings where the pipe size or shape calls for one.
Each one is primed, taped, and clamped at the top, and we check them all during spring and fall inspections.
Next Step
Call A Flagstaff EPDM Roofing Contractor
Tell us how old the roof is and where the leaks show up. We will test the seams and explain whether repair or replacement fits.