attic/ceiling question........

[heyttown]

I have a back addition on my house that includes a full bath...The ceiling inside the house is flat and around 8' height.Im starting to plan the remodel my bathroom, and Im thinking about making the ceiling match the roof pitch...My concern is this roof has soffit vents and roof vents near the top and im sure will get cold in the winter.....How do I insulate/protect the drywall, and still follow the pitch of the 2x6 trusses....<br /><br />Im picturing installing that 2" think pink styrofoam as insulation and glueing/installing them so they would be flush with the bottom of the trusses,and on top of the vapor barrier/drywall....If I were to install regular insulation,Im afraid of blocking the air flow.<br /><br />Any thoughts or opinions.

 

[Ron G]

Re: attic/ceiling question........

heytown they make insulation baffles that you staple inbetween the rafters then you insulate over the top of them i wouldnt use a plastis moisture barrier if you do want a moisture barrier use tyveck or something that can breathe and use water proof sheetrock .and use reg insulation r-19

 

[craze1cars]

Re: attic/ceiling question........

Not sure where you live. Here in much of the midwest, we like to see about R-40 or more in an attic. 2 inches of pink foam will get you somewhere around R-5, I believe. I don't care for cathedrals for just this problem.<br /><br />Best solution, in my opinion, would be a false cieling inside the attic that follows the pitch, but leaves lots of space for conventional insulation. That's how the cathedral was set up in my great room. From inside the attic, it looks like a peaked roof that's covered in 18 inches of insulation and still leaving about a foot of airspace between the top of the insulation and the real roof.<br /><br />This is for just a bathroom? Don't forget you need room for a ventillation fan and ducts also.

 

[one more cast]

Re: attic/ceiling question........

I used RAFT-R-MATE's with fiberglass insulation on my sloped ceiling project and it worked well.<br /> raft-r-mate

 

[Mark42]

Re: attic/ceiling question........

Ohio... Cold in winter. You need R40 or better. Think about the false ceiling idea to give the extra space for ventilation and insulation. Install 2x4's offset from the existing rafters 10". If the rafter is a 2x6, you will end up with about 15" total space. That is more than enough space for r40 and the RAFT-R-MATE's. If you install a fan, choose rigid aluminum vent over the flexable aluminum or plastic becasuse it performs better giving more CFM's for same size vent than any flex tube. And less nooks and cranies for dust to build up too.<br /><br />I like high ceilings in bathrooms because it takes longer for the steam to build up to the point where the mirror fogs. <br /><br />A skylight is a nice touch too, but does let in some cold.

 

[rogerwa]

Re: attic/ceiling question........

On my risers (if that is the right term) in my upstairs, I screwed 2x2's right on to the edge fo the 2x6 which gave me 8" between the roofing and the drywall. I stapled the plastic vents (raftr mates) and blew insulation in behind the drywall. The snow didn't melt on my roof.

 

[Xcusme]

Re: attic/ceiling question........

Actually, the 'Pink' stuff (rigid foam insulation- extruded poly-styrene) is rated at R-5 per INCH. Link <br /> <br />Another type is Polyisocyanurate foam board (cream colored foam) is rated slightly higher at R-6.5 to R-7.0 per inch. Link