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Old 02-08-2019, 10:46 AM   #1
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Gazebo roof - replacing fiber cement with asphalt shingles


Hi All,

I'm working a gazebo and covered picnic tables reroof project for my HOA ... northwest Florida about 12 miles from the coast ... about 20 years old.

The current roof is fiber cement shingles - edge deterioration is beginning to degrade look and ability to keep rain out. These are laid on a frame, but without sheathing.

We decided the cost of fiber cement or synthetic slate replacement is too expensive and unnecessary since the most common roofing single in the neighborhood is fiberglas asphalt. So, we have chosen to replace both with a high grade architectural (3D look for some depth) that would somewhat resemble slate like most of the neighborhood roofs. Want it to be gray like slate.

Given the framework for the old fiber cement won't hold the composite shingles, we need to sheath the entire roof with one side of the (plywood) sheathing suitable for white paint - with NO NAILS PROTRUDING.

I need help deciding how to do the sheathing - local contractor have asked that we decide this (and the shingle desired) prior to bidding - seems fair. So, the question is: will a 1" roofing nail pierce the bottom side of 3/4 plywood using shingle like this, https://www.owenscorning.com/roofing...or=estate-gray, or this, https://www.certainteed.com/resident.../grand-manor/?

If you think it will perforate with the above, we have to go to 3/4" plus 1/2" sheathing - lots of extra labor and materials.

Would appreciate your thoughts!
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Old 02-08-2019, 11:02 AM   #2
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


We have done that with bead board facing down for the look, above the strap it with 2x4 on top of the rafters and then 1/2" OSB. The roofing nails will not come thru.
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Old 02-08-2019, 11:05 AM   #3
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


Neal,

Not sure I follow - the bottom side must be paintable one side plywood ... whether it is on 2/4s on the rafter or not wouldn't a 1" come though any 1/2" sheathing?
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Old 02-08-2019, 11:23 AM   #4
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


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Neal,

Not sure I follow - the bottom side must be paintable one side plywood ... whether it is on 2/4s on the rafter or not wouldn't a 1" come though any 1/2" sheathing?
2x4 between the sheet you paint and the sheet that the nails go thru. That makes the sheeting 2 1/2 inches thick
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Old 02-08-2019, 11:36 AM   #5
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


Got it ... only we have created another 1 1/2" around the perimeter of the that we would need to close off the end of box created by the spacer 2/4s, right?
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Old 02-08-2019, 11:49 AM   #6
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


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Got it ... only we have created another 1 1/2" around the perimeter of the that we would need to close off the end of box created by the spacer 2/4s, right?
Yes and you could also add a vent on the under side at the bottom and vent on the peak of some sort if you were so inclined.
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Old 02-08-2019, 02:12 PM   #7
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


they make 3/4" roofing nails. They will not poke through. You can get them in hand or gun versions last I knew.
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Old 02-08-2019, 02:34 PM   #8
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


I didn't think they were code in Florida ... high winds ... 130 MPH shingle required...
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Old 02-08-2019, 02:37 PM   #9
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


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they make 3/4" roofing nails. They will not poke through. You can get them in hand or gun versions last I knew.
The problem with that is the next guy wrecks the inside with out thinking about it.
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Old 02-08-2019, 04:32 PM   #10
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Re: Gazebo roof - replacing fiber cement with asphalt shingles


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The problem with that is the next guy wrecks the inside with out thinking about it.
That is a fair point but I try not to live my life worrying about the next guy especially if he is 30 years down the road.

As to Florida codes I have no knowledge.Because 1" nails were mentioned I just pointed out 3/4" nails exist.

What is holding up the current fiber cement shingles? Purlins? If so what are the spans of the rafters holding up those purlins?
What is the weight of the current roof verses 3/4 ply and laminated shingles?
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