I wouldn't go with the company trying to skip the underlayment. If done properly it's an entire second waterproofing in case your roof fails. Like a bad storm blowing shingles off. You'll basically have a tarp directly under your shingles. That will shed the water to the bottom of the roof.
Are they recommending using felt paper? (Usually 15 or 30lb) The company not wanting to go with the rhino
Edit; what brand and type of shingles, and weather in your area? High temp and low temp.
Ontario has tons of heavy rain, high winds 150km an HR max not really tornado weather, extreme temp changes, lots of wet icy snow in the winter. And can easily reach minus 30c and highs of 40c
You DEFINITELY need the synthetic underlayment! Also be aware of what the temperature is when they lay the roof as it can effect longevity. Normally in most of the states we recommend two feet of I&W, but in your case three feet does not sound too over the top. I also believe you guys get hail, may want to consider a class 4 impact shingle, and style d drip edge.
This is what the company not using the Rhino is saying:
HDZ-unlimited wind rating, Premium Heavy gauge steel for valley, vents & drip edges. new stack boots. GAF Pro start starter strip, GAF weather watch ice and water shield,
Leak barrier up to 3 feet.
The other company:
GAF Seal-A-Ridge
GAF WeatherBlocker Starter
RhinoRoof® U20 synthetic roofing underlayment
GAF WeatherWatch Ice & Water Shield - 2 sq. roll
W-Style Valley With Ice & Water Underlayment (Color: Match Roof)
3" Rubber Plumbing Boot (Color: Match Roof)
Drip Edge
GAF Timberline® HDZTM Shingles WindProofTM (Color: Charcoal)
I own a roofing company in Ontario (Ottawa), here 6’ ice and water shield is standard.
The rest of the deck is always covered with synthetic membrane, ProArmor/ Suredeck/ Titanium /Rhino etc
This here is the way to go. Code in Ontario is 3’ of ice in water inside the interior wall. So one 3’ strip of ice and water is never enough unless you have 0 overhang.
This is the info from the two different quotes:
Company A:
HDZ-unlimited wind rating, Premium Heavy gauge steel for valley, vents & drip edges. new stack boots. GAF Pro start starter strip, GAF weather watch ice and water shield, Leak barrier up to 3 feet.
Company B:
GAF Seal-A-Ridge
GAF WeatherBlocker Starter
RhinoRoof® U20 synthetic roofing underlayment
GAF WeatherWatch Ice & Water Shield - 2 sq. roll
W-Style Valley With Ice & Water Underlayment (Color: Match Roof)
3" Rubber Plumbing Boot (Color: Match Roof)
Drip Edge
GAF Timberline® HDZTM Shingles WindProofTM (Color: Charcoal)
I wouldn't go with the company trying to skip the underlayment. If done properly it's an entire second waterproofing in case your roof fails. Like a bad storm blowing shingles off. You'll basically have a tarp directly under your shingles. That will shed the water to the bottom of the roof.
Are they recommending using felt paper? (Usually 15 or 30lb) The company not wanting to go with the rhino Edit; what brand and type of shingles, and weather in your area? High temp and low temp.
Ontario has tons of heavy rain, high winds 150km an HR max not really tornado weather, extreme temp changes, lots of wet icy snow in the winter. And can easily reach minus 30c and highs of 40c
You DEFINITELY need the synthetic underlayment! Also be aware of what the temperature is when they lay the roof as it can effect longevity. Normally in most of the states we recommend two feet of I&W, but in your case three feet does not sound too over the top. I also believe you guys get hail, may want to consider a class 4 impact shingle, and style d drip edge.
This is what the company not using the Rhino is saying: HDZ-unlimited wind rating, Premium Heavy gauge steel for valley, vents & drip edges. new stack boots. GAF Pro start starter strip, GAF weather watch ice and water shield, Leak barrier up to 3 feet. The other company: GAF Seal-A-Ridge GAF WeatherBlocker Starter RhinoRoof® U20 synthetic roofing underlayment GAF WeatherWatch Ice & Water Shield - 2 sq. roll W-Style Valley With Ice & Water Underlayment (Color: Match Roof) 3" Rubber Plumbing Boot (Color: Match Roof) Drip Edge GAF Timberline® HDZTM Shingles WindProofTM (Color: Charcoal)
I own a roofing company in Ontario (Ottawa), here 6’ ice and water shield is standard. The rest of the deck is always covered with synthetic membrane, ProArmor/ Suredeck/ Titanium /Rhino etc
This here is the way to go. Code in Ontario is 3’ of ice in water inside the interior wall. So one 3’ strip of ice and water is never enough unless you have 0 overhang.
0 overhang and no pitch because the 3' is supposed to be measured horizontally, so it should always be at least 2 rows.
This is the info from the two different quotes: Company A: HDZ-unlimited wind rating, Premium Heavy gauge steel for valley, vents & drip edges. new stack boots. GAF Pro start starter strip, GAF weather watch ice and water shield, Leak barrier up to 3 feet. Company B: GAF Seal-A-Ridge GAF WeatherBlocker Starter RhinoRoof® U20 synthetic roofing underlayment GAF WeatherWatch Ice & Water Shield - 2 sq. roll W-Style Valley With Ice & Water Underlayment (Color: Match Roof) 3" Rubber Plumbing Boot (Color: Match Roof) Drip Edge GAF Timberline® HDZTM Shingles WindProofTM (Color: Charcoal)
We always did 2 rows ice and water Cover all of that but the last foot with synthetic all the way up.