Basement Framing for HVAC
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IMHO, don't use any wet wood as you want to cover it before it can totally dry out... and tar paper is not recommended under a bottom plate- it is from 5-30 perms, use some foil-faced 1/2" rigid foam board for an air/water/thermal break to the studs- they may let you use non-pt wood (full of chemicals) ask them; http://www.greenbuildingadvisor.com...ressure-treated-sill-plates-and-building-code
I'd be surprised if they want a double top plate in all your non-bearing walls, a simple metal strap at intersections- if required--will meet code and save a lot of money. Much easier to nail the wall to the floor joists above with a single plate on each end of wall on the floor before you stand them. Add blocking backers between joists for the running walls, not like they are going anywhere...
Minn. is 15/19 R-value, so unless you do some foam board on concrete wall first and make up the rest with 2x4 insulation.... ask locally- they may let you combine the 2 types for a total; http://energycode.pnl.gov/EnergyCodeReqs/index.jsp?state=Minnesota
Gary
I'd be surprised if they want a double top plate in all your non-bearing walls, a simple metal strap at intersections- if required--will meet code and save a lot of money. Much easier to nail the wall to the floor joists above with a single plate on each end of wall on the floor before you stand them. Add blocking backers between joists for the running walls, not like they are going anywhere...
Minn. is 15/19 R-value, so unless you do some foam board on concrete wall first and make up the rest with 2x4 insulation.... ask locally- they may let you combine the 2 types for a total; http://energycode.pnl.gov/EnergyCodeReqs/index.jsp?state=Minnesota
Gary
KULTULZ
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OK, I am no professional but I have a fear of metal studs in a basement due to possible humidity/water leaks and such. Am I overly paranoid?
Also, can BLUEWOOD be used in place of PT for floor plates (on slab)? Roofing felt is no longer recommended for use under floor plate?
Confused In W (By GOD) V...
nealtw
Contractor retired
OK, I am no professional but I have a fear of metal studs in a basement due to possible humidity/water leaks and such. Am I overly paranoid?
Also, can BLUEWOOD be used in place of PT for floor plates (on slab)? Roofing felt is no longer recommended for use under floor plate?
Confused In W (By GOD) V...
Around here commercial units will get metal studs for dividing up space and beside stairs, great for fire proofing but when it comes to office space washroom or anything that had a floor above, we were there to put in wood structure. We never see it in a basement, I would still want sill gasket under it.
Tarpaper? Sill gasket is already the right width.
You really want to limit the amount of treated lumber in the living space.
Painted lumber, we don't see it here yet but I am told it is great for cleaning up after a flood or mold growth, Really shortens dry out time.
KULTULZ
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Tarpaper? Sill gasket is already the right width.
OK, but the sill gasket will stop heat transfer to the slab but the tar paper will stop the moisture wicking from the slab into the framing, right (I actually used both)?
When I papered my first sill/bottom plates, I actually also wrapped the sides with the paper (Advanced CDO), not thinking it would slow the drying of the PT.
Learn something everyday...
nealtw
Contractor retired
Your not worried about the moisture in the lumber, it will dry, you are stopping the moisture from wicking up thru concrete to the wood. Any thing that stops moisture is usually acceptable but I have seen old tar paper break down years later when you take stuff apart. Sill gasket is the best because it will fill the voids and stop the water, I doubt it has much R values.
Humidity is a direct function of the comfort heat system and there is no "wicking" in steel.
This is always interesting to me, because if a home owner does not have an approved set of plans, I'm not interested, and when they do, and neither of us are in jeopardy, I follow the plan.
KULTULZ
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GOTCHA!
Felt will break down over time allowing wicking and sill gasket provides a moisture barrier (I guess it does as it is also used on sill plates) in addition to a thermal barrier. I was overbuilding...
But, isn't felt called for by code under a floor plate (on crete)?
All of the potential shortcoming in wood framing in a basement, are not found in steel, and why I use it.
I also warranty my work for the length of time the original person contracted with occupies the dwelling.
I also warranty my work for the length of time the original person contracted with occupies the dwelling.
My plan was all treated wood on the basement floor with a sill gasket under it. Do I need treated if I am doing a sill gasket?
Also, I have one wall that has 4 2x6 studs holding up my load bearing header or whatever its called. when I figure my 2x4 wall with a 2" insulation behind it that is only 5.5". is 1/2" ok to drywall around, or am I better off trying to pull the whole wall forward 1/2 inch? and if I pull the whole wall out 1/2 inch, do I need to add another 1/2" sheet of insulation behind the wall because of a fire block or anything like that? Just trying to figure out the best way to frame around that support. I don't know if drywall can be screwed to that type of thing or not since its structural.
Also, I have one wall that has 4 2x6 studs holding up my load bearing header or whatever its called. when I figure my 2x4 wall with a 2" insulation behind it that is only 5.5". is 1/2" ok to drywall around, or am I better off trying to pull the whole wall forward 1/2 inch? and if I pull the whole wall out 1/2 inch, do I need to add another 1/2" sheet of insulation behind the wall because of a fire block or anything like that? Just trying to figure out the best way to frame around that support. I don't know if drywall can be screwed to that type of thing or not since its structural.
nealtw
Contractor retired
GOTCHA!
Felt will break down over time allowing wicking and sill gasket provides a moisture barrier (I guess it does as it is also used on sill plates) in addition to a thermal barrier. I was overbuilding...
But, isn't felt called for by code under a floor plate (on crete)?
That what we did But Gary just pointed out the code change so now it is gasket
nealtw
Contractor retired
Treated on the bottom may be code in some places and against code in others.
So best you check. The post holding up a beam is called a point load. And I would just adjust the wall to match for a 1/2", as long as it doesn't screw the lay out somewhere else
nealtw
Contractor retired
You want to build your wall with a gap there anyway in case it is not perfectly straight. the fire stop is the drywall at the ceiling.
OH, Thanks!! I would have just slammed it right against the insulation!! I am checking with the inspector, but I may step down to 1" R-5 rigid insulation tuck taped and glued to the walls, then leave 1/2" gap behind, except that one wall, that one i'll make flush with the point load.
the builder installed R-10 rigid insulation on the outside of the block, so if I do R-5 on the inside, I believe that will give me my R-15 requirement. then if i want I can add Roxul to add more if I want... not sure if that would be over kill or not. I estimate it would cost me $900 for enough Roxul...
nealtw
Contractor retired
I would choose between fiber glass and safe and sound by price only.
If your foam passes code and you think you may more consider just the top half. or just to the depth of the frost level in the area. For many years here that is all we had to insulate and basements were comfortable.
If your foam passes code and you think you may more consider just the top half. or just to the depth of the frost level in the area. For many years here that is all we had to insulate and basements were comfortable.
Ok, I thought maybe the Roxul due to moisture, but then I guess that is what my rigid is for, that is my moisture barrier, so I shouldn't need to worry about moisture in relation to in wall fiberglass right?
Fiberglass insulation is about half the price.
Fiberglass insulation is about half the price.
nealtw
Contractor retired
Wet insulation is no insulation but when it gets wet you can take fiber glass out and let it dry and re use it. And somewhere there is chart on sound and I think fiber glass is actually better.
