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Which Is The Proper Roofing Felt To Use?

 
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Old 04-10-2012, 09:51 PM   #21
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Re: Which Is The Proper Roofing Felt To Use?


Many of the synthetics actually offer far more traction when wet than felt, and are tear-resistant as well. The only downside is that they do tend to be more expensive, so a lot of builders elect to save a kopeck or two.
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Old 04-11-2012, 06:10 AM   #22
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Re: Which Is The Proper Roofing Felt To Use?


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Originally Posted by CSinMa View Post
not quite sure what that means Tom, what IS why?
why is what you want an underlayment to do,whether wind resistance, walkabiliy,exposed durability, air infiltration etc.. then choose it accordingly
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Old 04-11-2012, 06:41 AM   #23
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Re: Which Is The Proper Roofing Felt To Use?


isn't felt paper of any kind just for expansion and contraction of different materials, to make sure nothing buckles, binds or gets snagged?
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Old 04-11-2012, 12:15 PM   #24
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Re: Which Is The Proper Roofing Felt To Use?


if thats what you need to do then any paper will do,even rosin

but lets think about this for awhile..what else would be important on a roof?
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Old 04-11-2012, 05:57 PM   #25
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Re: Which Is The Proper Roofing Felt To Use?


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Originally Posted by Tom Struble View Post
but lets think about this for awhile..what else would be important on a roof?
The most important job (on shingle roofs) of the [underlayment] is being a secondary drainage plane- in case of blow offs, or an ice dam backs up under the shingles, or the roofers didn't do the valley right, etc.
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Old 04-11-2012, 06:04 PM   #26
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Re: Which Is The Proper Roofing Felt To Use?


Unfortunately tar paper of any kind was considered optional around here for years. Going to be tons and tons of roofs to do in a few more years.
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Old 04-11-2012, 08:54 PM   #27
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Re: Which Is The Proper Roofing Felt To Use?


Not a roofer at all but I do my own and it doesn't leek. I used tar paper under the whole install.....good or bad..
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Old 04-11-2012, 08:57 PM   #28
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Re: Which Is The Proper Roofing Felt To Use?


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Not a roofer at all but I do my own and it doesn't leek. I used tar paper under the whole install.....good or bad..
That's good.
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Old 04-11-2012, 09:07 PM   #29
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Re: Which Is The Proper Roofing Felt To Use?


back in the 80's builders found a loop hole to not use felt. I always wondered what those plywood sheets look like now?
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Old 04-13-2012, 06:04 PM   #30
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Re: Which Is The Proper Roofing Felt To Use?


For me personally I never use 15# 30# is min. and prefer synthetic if the H.O will go for the extra cost. TNT mentioned it being slick and it is slicker than felt if it is wet, real slick, but when it is dry most of it is nice and grippy to walk on and it wont tear out on you. The extra cost is worth the grip on a steep roof. Another thing to remember is to not be a cheap a** and cover up the Ice shield with felt or the syn. felt also, otherwise if it's a hot day when you go to tear off the old shingles those last few rows sometimes stick to the I&W like superglue.
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Old 04-13-2012, 06:05 PM   #31
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Re: Which Is The Proper Roofing Felt To Use?


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back in the 80's builders found a loop hole to not use felt. I always wondered what those plywood sheets look like now?
What was the loophole? Curious what the excuse was.
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Old 04-14-2012, 02:28 PM   #32
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Re: Which Is The Proper Roofing Felt To Use?


Here's the real purpose of the felt paper under shingles.
As warm moist air rises, it passes through the sheetrock ceiling in your home and up through the attic.
The felt paper allows the moist air to pass through, but if some of the moisture condenses on the underside of the shingle, the felt paper keeps that condensed moisture from touching the wood.
If the condensed moisture were to be in contact with the wood, over time the wood would be damaged.

The other reason for the felt underlay is to provide a simple barrier between the asphalt in the shingles and the wood sheathing. The sap in the wood isn't good for the shingles.
On the low pitch roofs, under 4:12 but over 2:12, a double underlayment is required.
not double thickness, like going from 15 lb to 30 lb. But two actual layers.
It also doesn't mean a complete covering of one layer of underlayment, and then another layer of underlayment over the first one.
It means that after one row of felt paper is layed down, the next row needs to start at the halfway point on that first row, not at the top edge of the first row.
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Old 04-14-2012, 05:22 PM   #33
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Re: Which Is The Proper Roofing Felt To Use?


Quote:
Originally Posted by CSinMa View Post
Here's the real purpose of the felt paper under shingles.
As warm moist air rises, it passes through the sheetrock ceiling in your home and up through the attic.
The felt paper allows the moist air to pass through, but if some of the moisture condenses on the underside of the shingle, the felt paper keeps that condensed moisture from touching the wood.
If the condensed moisture were to be in contact with the wood, over time the wood would be damaged.

The other reason for the felt underlay is to provide a simple barrier between the asphalt in the shingles and the wood sheathing. The sap in the wood isn't good for the shingles.
On the low pitch roofs, under 4:12 but over 2:12, a double underlayment is required.
not double thickness, like going from 15 lb to 30 lb. But two actual layers.
It also doesn't mean a complete covering of one layer of underlayment, and then another layer of underlayment over the first one.
It means that after one row of felt paper is layed down, the next row needs to start at the halfway point on that first row, not at the top edge of the first row.

http://arrowheadroofing.com/news/roo...-real-purpose/

Hmmmm? Google search much?
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Old 04-14-2012, 05:26 PM   #34
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Re: Which Is The Proper Roofing Felt To Use?


i don't buy that condensation won't form under the felt

most synthetics are actually vapor barriers
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Old 04-14-2012, 08:05 PM   #35
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Re: Which Is The Proper Roofing Felt To Use?


Quote:
Originally Posted by CSinMa View Post
As warm moist air rises, it passes through the sheetrock ceiling in your home and up through the attic.
The felt paper allows the moist air to pass through, but if some of the moisture condenses on the underside of the shingle, the felt paper keeps that condensed moisture from touching the wood...
Warm air passing through the drywall will condense on the underside of the sheathing, NOT on the shingle side (cold side/top) of the sheathing.
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Old 04-14-2012, 08:28 PM   #36
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Re: Which Is The Proper Roofing Felt To Use?


Hmmm, if these guys are worried about condensation I think they should be adding some ventilation not more layers of felt.
Am I wrong?
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Old 04-14-2012, 10:35 PM   #37
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Re: Which Is The Proper Roofing Felt To Use?


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Hmmm, if these guys are worried about condensation I think they should be adding some ventilation not more layers of felt.
Am I wrong?
If their is adequate ventilation, then more won't do anything to prevent the moisture. You really need to address the heat loss at the source. Sealing all areas of penetration would be the first step.

But even at that. Am I supposed to believe that the moisture is going to penetrate the sheathing and tar paper before resting on the underside of the shingles?
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Old 04-14-2012, 11:04 PM   #38
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Re: Which Is The Proper Roofing Felt To Use?


Almost every attic is under ventilated. Code is 1sf of ventilation for every 150sf of space. Note: A 8" hole for a 1 sf vent doesn't count as 1 sf.
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Old 04-14-2012, 11:15 PM   #39
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Re: Which Is The Proper Roofing Felt To Use?


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Almost every attic is under ventilated. Code is 1sf of ventilation for every 150sf of space. Note: A 8" hole for a 1 sf vent doesn't count as 1 sf.
It would if it were 8x18
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Old 04-14-2012, 11:16 PM   #40
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Re: Which Is The Proper Roofing Felt To Use?


Then it wouldn't be an 8" hole.

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