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6 Answers

Chimney chase condensation

Hello All,
Classic problem I believe.

I have a wood framed chimney chase which houses two 8" insulated, stainless steel metalbestos wood stove pipes and my main DWV stack. On certain days, when the inside/ outside temps, and the relative humidity are just right, I have condensation build-up and dripping from the underside of my chimney chase roof.
Construction detail:

Roof:
6x10 timber rafters 36" (on center)
2 x 6 rough sawn decking (not T&G)
Grace Tri-Flex
3 layers of 3" Polyiso foam board
2x6 Sleepers 36" (on center, screwed to rafters below)
3/4" T&G OSB decking

Asked By Dave Cummings | Feb 16 12
2 Answers

In Md. I have a vapor barrier and I want to insulate and finish basement

What is the best way to finish the basement. I already paid for drainage system; vapor barrier is up on walls. What is the best type of installation...? Basement is framed 24' vs 16. This is so frustrating for me, my brother gave me R19 that he had left over but I don't think I can use it. Someone told me not to use paperback fiberglass near vapor barrier...Help!

Asked By blgoodw | Nov 20 17
4 Answers

I want to build a wall in front of a masonry wall that emits moisture.

Dear GBA folks,

This fieldstone carriage house, built in 1910, has 22" thick stone walls (see picture). Inside on the second floor, 2x4 stud walls built about 2" away from the stone are covered with 1" plaster.

Asked By Robert Cramer | Nov 13 17
4 Answers

Why caulk between studs, etc?

I understand that a small amount of air can pass through the gap between two or more side-by-side framing members, but so what? Then that air hits the drywall, which is an air barrier. In the middle of a stud bay, that same air is passing through fiberglass batt insulation (not an air barrier) and hitting the drywall. What's the difference? For that matter, why caulk the drywall to the top plate? Isn't the intersection of the wall and ceiling drywall taped and mudded? Isn't that an air barrier?

Asked By JeffSch1 | Nov 8 17
3 Answers

Will radiant heat system PEX tubing melt polyethylene vapor barrier?

The heating contractor we hired to install a hydronic radiant heat system for our backyard cottage project did not put a polyethylene vapor barrier on top of the gravel, under the 2" rigid foam insulation. The rigid foam insulation panels he installed have a mylar-like film on the under side, which he thinks is sufficient. We live in VERY wet Western Washington so I'm wondering if this will in fact be enough.

Asked By Mightorta | Nov 12 17
5 Answers

Why does insulation have to contact six sides?

On the internet I've read about 15 years worth of claims that insulation must contact all six sides for it to be effective, but haven't seen an explanation why. Yes, I've read many times that a building's insulation and air barrier must completely surround the conditioned space and be in contact with each other, but can't find the science behind it explained. I would sure appreciate a scientific explanation from anybody. Thanks very sincerely.

Asked By JeffSch1 | Nov 8 17
4 Answers

Air barrier

I live in zone 3 central west virginia, and designed my own home,construction of which is currently under way.

Asked By ryoung26554 | Nov 7 17
1 Answer

Sealing up rim area on brick veneer house.

Working on re-insulating the ceiling of the tucked-under garage on a 50 year old brick-veneered Cape Cod in the Philadelphia area. Ceiling demo was done earlier this week. On inspecting the rim areas I find that the 2x10 joists sit directly on the cement block wall with only some slate pieces under most ends, perhaps for leveling and alignment. There are no wood sills and no rim joists. Looking in, I am seeing the backs of the brick veneer with small piles of dropped mortar from the brick laying process. Overall, the bricks and mortar look fine.

Asked By Geoffrey Simon | Nov 2 17
19 Answers

Alternatives to foam under slab or no slab?

Are there any alternatives to foam under a slab that might be "cost effective". I realise that CE is a very loaded term, so don't get bogged down in that term.
Obviously, I am not interested in VIP's. But how about the cost and performance of Perlite? Are there other alternitives?
I am looking at a Passive House in a 5, maybe 6, climate zone.
XPS may be available to me at a reduced cost because my wife works for a large company that makes the stuff. Am I wasting my time looking at alternative insulation products if I can get XPS at a discount?

Asked By Steve Young | Aug 23 12
11 Answers

Looking for help on our cathedral ceiling insulation detail

I'm the owner and builder. 1300 sq. ft. addition in southern Maine, Zone 6. Simple salt box design. Rear roof 3/12 pitch. Front roof, 6/12. 17' high at ridge beam, sloping to about 8' in rear.

Thanks for your time,

Tony

Asked By user-6941533 | Oct 25 17
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