Why I have a firm position on polyurethane Spray Foam.

[puddles]

Hey Olger...my dh and I are planning on using the spray foam to insulate our house. I do have a question since you are our resident expert in this field. How well will that stuff stick to OSB? Reason I ask is dh has put OSB down on our upstairs floor area and needs to innsulate the ceilings of our downstairs (underneath the floor of the upstairs) before he puts up the drywall. He isn't sure it will "stick" and is concerned.

Thanks! Was inspired by your testimony!

[olger]

Hi Puddles.

The adhesion of SPF to OSB is somewhere between tenacious & outstanding. In other words - excellent!

Question. Why insulate between the floors?

Have fun,

`oG

[puddles]

Thanks!!!

As for your question...I dunno! He has his reasons I guess and he is the chief builder/contractor/electrician/plumber/grunt.

I'll ask and let you know!

Thanks again. I think it will ease his mind with this knowledge!

Blessings!

[olger]

One of the advantages of multiple floor homes is that they are more efficient (1st floor heat rises/acclimates into the second floor area).

Isolating the two floors from each other with a powerful insulation like SPF is a good idea if one floor is not going to be heated (presumably the second floor) and the other one is. If both areas are going to be heated, the insulation will prevent the two areas from normalizing (acclimating) each other.

Husband sounds like a handy guy.

G

[GreatLakesGramma]

I've read that insulation can be put into interior walls to sound-proof the rooms, as in apartments, so one tenant's noise will not bother other tenants. Maybe your husband is thinking of future teenagers in the house? Or are your children already teens?

[olger]

Good point. If that is the case, then open-cell foam is the product of choice, or better yet, Ultra-Touch cotton batts.

blessings,

G

[Dr. Shane]

Where does one buy cotton batts? I am building on a two story addition with a master bedroom on top and a living room on bottom. I need sound batts in the floor.

[olger]

Bonded Logic,Inc.

www.bondedlogic.com

In the floor/ceiling - install an R19 x 16 (or 24, depending on joist spacing).

We use a semi-load of this material annually. Works great.

Have fun,

G

[Dr. Shane]

Wow, that is a green product.

[olger]

Yeah, I know.

Sorry.

[Dr. Shane]

I am building the addition out of concrete block. I fill the cells in the first course with sand (except, of course, those core-filled with concrete) and above the first course, I am using cellulose. A local supplier sells styrofoam pellets to use in the cells but it is an open-cell and has very little R-value with a cost about the same as the cellulose. I filled the first course with sand because when the block gets wet it tends to run down and the first course gets the wettest. Thus no cellulose will be sitting inside the wettest blocks on the first course. I'll blow the attic full of cellulose. The closed-cell foam I want to spray in the walls in the trailer. If I get a chance tomorrow maybe Ill call that guy back with some questions.

[Dr. Shane]

OK, the quote is for $2.15/sf for a large job and $2.35/SF for a small job. That is closed cell, 2 1/2".

[olger]

Not bad Shane. What brand of SPF?

I am wondering how the cellulose in the CMU will dry if it gets wet? You probably have a plan..

G