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4just1don 05-17-2009 07:10 PM

another soffit question
 
House has fascia that is square with the end of the rafters. Its a 5 or 6 -12 roof making it about a 45 degree angle. Should I change the angle to straight up and down so I have an easier time fastening rain gutters to it? how would you fasten a gutter to a 45 degree angle fascia?

Other reason thought it would be GOOD is it makes my soffits about 3" longer so MORE space for air flow. Otherwise they are only about 9" long therefore not too much air can get thru,,,they would be about a foot if fascia changed.

IF I did this I would have about a 3" triangle with NO wood behind on end of gable fascia,,,do I need to add some wood or is a 3" void okay??

other factor is I cant get baffles in there,because I have 16" wall studs coming up and 24" roof rafters so there is everything in the way. There is about a 2-3" gap between sheathing of wall and roof sheathing,is THAT enough??? (2X4 roof rafters are heavily notched). Whole house is about 700 square feet and built in a 't' shape,,, w/ triple gable

and while I am asking of soffits and vents,,,the front porch is about 12' long and on side of the gable that covers the kitch. The kith roof is about a 6-12 and drops 8' or so, then lowers 4" and drops on the porch roof,which is flatter. So how do you put vents in that 4" space between kitch roof and porch roof??

JohnCarpenter 05-17-2009 08:50 PM

quote "House has fascia that is square with the end of the rafters. Its a 5 or 6 -12 roof making it about a 45 degree angle. Should I change the angle to straight up and down so I have an easier time fastening rain gutters to it? how would you fasten a gutter to a 45 degree angle fascia?"

A 12 - 12 roof is 45 degrees. 6 - 12 is 22-1/2 . You wouldn't put a gutter on that angle, the water would run right past it.

quote" other factor is I cant get baffles in there,because I have 16" wall studs coming up and 24" roof rafters so there is everything in the way. There is about a 2-3" gap between sheathing of wall and roof sheathing,is THAT enough??? (2X4 roof rafters are heavily notched). Whole house is about 700 square feet and built in a 't' shape,,, w/ triple gable"

a 2 to 3 inch gap is ok in the attic if you are talking about the access to the eaves.

:eek: 2x4 rafters on 24" centers.


Other reason thought it would be GOOD is it makes my soffits about 3" longer so MORE space for air flow. Otherwise they are only about 9" long therefore not too much air can get thru,,,they would be about a foot if fascia changed.

IF I did this I would have about a 3" triangle with NO wood behind on end of gable fascia,,,do I need to add some wood or is a 3" void okay??


Standard soffit vents here are 8x16 and we normally cut the hole 1" smaller all the way around. Making the eave larger than this won't increase air flow.

If you have a ceiling vapor barrier you need 8' Ridge vent and about 4 - 8x16 soffit vents. If you do not have a vapor barrier, then you need to double the amount of vent. That is minimum We generally put a soffit vent every 8' and ridge vents continuous from 4' from the end of the roof.

You would have to build the facia square. It also needs to be solid behind the gutter or the gutter will sag and twist.

and while I am asking of soffits and vents,,,the front porch is about 12' long and on side of the gable that covers the kitch. The kith roof is about a 6-12 and drops 8' or so, then lowers 4" and drops on the porch roof,which is flatter. So how do you put vents in that 4" space between kitch roof and porch roof??

Those little spaces have made many a carpenter throw their hammer across the yard. Try a dremel to cut the hole and a stubby screwdriver to attach the vent.

4just1don 05-17-2009 09:40 PM

thanks John,

I SHOULD have been more clear. I am using continuous vent aluminum soffit. THEN I am going to put ridge vent on what ridges I have!! But I have NO idea what to do with that 4" space from the regular house roof down to the porch roof. I am SURE there is flashing in that space also because otherwise the water would run down thru the wall where the porch back wall is. I guess it gets nothing because nothing will fit and keep water OUT!!

I dont think I have poly vapor barrier on the ceilings,,there is on the walls as I see when opening walls for windows. BUT it does have double ceilings. It used to be 9' ceilings and I lowered them to 8' YEARS AGO. think they used to say NOT to put poly vapor up there as it makes a house too tight. Things have changed over time. back in the 70's they said NO.

creamaster 05-18-2009 10:18 AM

When I had my house built while living in FL in 2004 they had just changed the code for the fascia so that it had to be at an angle like you have explained. They changed the code becuase of hurricane wind, im guessing it was safer for the roof/house during high winds. So depending on where you live if you change the angle you may be going against code. Just an fyi.

Gary in WA 05-18-2009 11:44 AM

You need something similar to this: http://www.cor-a-vent.com/in-vent.cfm

Locate the soffit vent close to the facia board to avoid snow or rain from entering by positive wind pressure: Audel Complete Building Construction - Google Book Search Pages 615, 616.

Be sure to use the NFA = net free area, when figuring ridge and soffit vents: http://www.cornerstoneinspectionsdfw...ntilation.html

Check carefully the ridge vent's NFA, they range from 8-18 square inches per lineal foot.

Also the soffit vent (ig. 8x16 vent = only 58 square inches NFA).

Your 700* house / 150 (w/o v.b.) = 4.67 or 5 square ft. vents. 1/2 up = 2.5ft., in inches=2.5 x 144= 360 square inches 360/ 18 = 20' of ridge vent or 45' (8 per ft.), big difference.

Continuous soffit vent has NFA of 9 square inches per lineal foot. 360 sq.in./9 = 40' of venting required.

Be safe, G


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