BoJes caught up to me in another thread with this…
“Piffin! You are a hard guy to track down~
I posted the below discussion and did not get many responses š Could you take a look and let me know what you think? Hope work is well and you are enjoying the beautiful weather. We had a water weekend near you and it is as good as it gets!
Helping out sis’ and wanted to double check w/ u guys to make sure she gets top notch work. Here is what I’ve got:
>Zone 6 heating climate
>Crawl space w/ 4″ layer of crushed stone over dirt(damn!)
>FHA unit in crawl space
>Bath fan vents to crawl space
>Crawl space floor is below grade
My plan of attack:
> Vent bathroom to outside (bath is in middle of home, I was thinking I would continue exhaust through basement to ext sill joist)
> Install 2″ foam between joists and around entire rim. Seal edges with foam.
> Rake stone to one side, lay poly(8 mil?) and tape to foam.
> Mastic FHA duct work
>Cover poly with all stone and lay other side with same detail.
> Talk about gutters and other ways to prevent infiltration from the outside.
My questions are, should I put in an basement exhaust fan as well? Do u think I need to cover the foam w/ a 15 min fire barrier? And…do you agree I should insulate the walls and not the floor?
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Replies
All of that is good.
As I recall, this has a rough rubble foundation?
Sometimes with those, were insulate the walls by draping them with the foil bubblewrap sold under various names like Astrofoil, which is also a VB
There is a heavy vaporstop with ripstop weave for under stone. I can't remember the name of it offhand. If you use plain old plastic I would double it up. The stones will make a few holes.
I'm guessing that this is a budget job, but an easier way to do this is to have a couple inches of foam sprayed everywhere.
the most important is getting that dryer vented out. If you add the other put it on an automatic humistat.
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
Thank you sir! Oh, what did you mean by "...keeping business out of the church pews"?
That was somebodies thread about fest activities. So interrupting personal fun stuff with business things is much like playing poker and laughing at a funeral, or while the Pope is saying Mass, LOL
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Piffin, does the bubblewrap require a fire barrier?
Family.....They're always there when they need you.
Don't know. Most FB requirements have to do with combustion sources and living space.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Let me clarify. When I line the walls of a crawl with rigid insulation i'm required to cover it with drywall. What i'm asking is if I use the bubble wrap do I still have to cram drywall down through a crawlspace access?
Family.....They're always there when they need you.
now let me clarify.You have to ask your BI.I do not live under any inspections for this sort of thing.
My interpretation of what I know about it is that foam must be covered when used in living spaces, not in crawl spaces, or when separating a combustion source from a living space.The bubble wrap is not foam. I do not know what the flame spread index is on it.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Gotcha. Heres a good one for ya.
My BI insists that I "fire stop" my rigid foam with drywall in the crawl space but forbids a stove install closer than 18" to a drywalled side wall.
If my stove if 15" from that side wall, I better break out the tile, or a piece of stainless steel, or something that isnt drywall.
So, my building dept considers drywall firestop material...........except when it doesnt.
Family.....They're always there when they need you.
One of the polyiso's with foil surfaces was listed to be used exposed in unoccupied locations shuch as attics and crawlspaces.The purpose of covering foam is so that it won't burn and create smoke. But it is being used in a place where there is normally not excessive heat. It is only "used" after you have a problem. The amount of hold out is only short term.While behind a wood stove it is continous exposed to high temps that it has to resist.The is SOME logic between the 2 different applications. But I am not saying how much..
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
I know, it just seems funny.
Family.....They're always there when they need you.
Two different things. A "fire stop" is not a "non-combustible material" which is what is required behind or within certain distances from some appliances.
The drywall over the insulation is to reduce flame spread, help prevent the insulation from becoming an accelerant (sp?),and help prevent the spread of toxic gases by preventing ignition.
I have never heard "fire stop" applied to this however , I have always heard the term "fire resistant cover". Here a "fire stop" is generally considered a blocking of a potential flue area within a structure.
Paper face on the drywall is "combustible" when heated to it's ignition point (and under repeated heatings it becomes easier for ignition to occur), which is why it is not allowed within certain distances of the stove.
They can't get your Goat if you don't tell them where it is hidden.
Yes I mispoke. It is not a firestop, just a cover.
Family.....They're always there when they need you.
IIRC the 2000 IRC calls it a thermobarrier.and I think that other materials can be used based on their flame/smoke spread rating..
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
I did not see anything about a dryer vent, he said (or at least you said he said) bath (still bad but not as bad I think) (:-)For those who have fought for it Freedom has a flavor the protected will never know.
Whateverit still needs vented out.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Oh I agree, with the bath fan you can play "what's that smell" all over the place.
Just pointing out dryer usually throws more moisture normally. Neither is acceptable for sure.For those who have fought for it Freedom has a flavor the protected will never know.