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7 Answers

Radiant barrier sheathing: how does it work?

From the literature it seems that it doesn't matter which side of the foil the radiation is on, as long as there's at least 3/4" air space on one side of the foil or the other. I always thought the air space (which is why you're supposed to staple foil faced batts to the side of the studs, not the face) had to be between the foil and the radiation you want to reflect. With TechShield, they advertise that +90% of solar energy will be reflected away from your attic with the foil facing down, the air space being on the opposite side from the radiation being deflected.

Asked By Bruce Cole | Jun 20 13
3 Answers

8-inch cinder-block foundation insulation (1 in. thick) on top of block, under 1x8 plate

I need a insulation 1 inch thick by 8 inch wide to put on top of an 8-inch cinder-block for sill insulation between cinder blocks and 1x8 wood plate?

Where can we find this type insulation, that is not rigid like air conditioner duct insulation?

Asked By Freddie Howard | Jun 21 13
1 Answer

Thin-film solar laminate

We're in the process of designing a home in zone 4A, and leaning towards a metal roof. I'm hoping this question is too open-ended, but I'm wondering what your experiences are with thin-film solar laminates (link below)? From what I've been able to find, they seem to be more expensive per watt and not as efficient as tradition PV panels, but they sure look much better! Is it possible to install these after the roof is installed, perhaps once the cost is down and/or efficiency improves? Is the product durable enough to survive its payback period?

Asked By Bill Greene | Jun 20 13
4 Answers

Cost of a corrugated roof for a 1200 s.f. house?

I'm working with a design-build firm in Oregon and my builder doesn't want to use corrugated metal for the roof, saying it's way more expensive than regular standard roofing material. Is this true?

Asked By s. bonte | Jun 5 13
1 Answer

Through Wall Spot HRV...Amazing! But I have a few questions...

Are you familiar with this product?

It is a through-wall HRV with an embedded ceramic plate. The way it works is it reverses its flow every 70 seconds, sending air through the ceramic plate and using its thermal mass as a heat exchange.

I am wondering if anybody has used this product and has any comments?

Also, the big question is, does this thing meet ASHRAE 62.2 requirements?


Asked By Zac Shore | Jun 5 13
4 Answers

Wood choices for exterior use (siding & decking) - Green pro's and cons?

I'm working on a project to rehab and convert a garage building to a studio and living space and am looking at options for exterior wood siding and decking.

I will be using Hardie Panels with reveal strips for much of the siding, however there are some areas I would like to use a clear finished wood siding for an accent. In addition I'm building a small ground level deck and want to match the decking to the siding wood. The totally square footage of wood being used fairly low at around 500 sq. ft.

Asked By Kevin Hardy | May 11 13
4 Answers

Nailbase SIP vs. rigid foam retrofit cost?

Posed question before about doing 4" of rigid foam on sheathing of 2X4 walls. Been reading and am interested in possibility of nailbase SIPs from company like Premier SIPs. These sound like wonderful products (I'm a big fan of SIP construction).

Asked By Matt Tackett | Jun 1 13
2 Answers

Would like comments comparing 5-ply waterproof plywood with Huber ZIP wall and roof sheathing

I will be building a U.S. EPA Energy Star to be certified home, (24'x40'), and am trying to decide upon the best sheathing for the walls and roof.

The proposed configuration for these two are:

1. Walls (2x6, 16" OC): vinyl siding, mesh rain screen, 3/4" foil faced polyisocyanate rigid foam (taped), either 5/8" 5-ply waterproof plywood or 5/8" Huber ZIP sheathing (both taped), 3 1/2 - 4" closed-cell spray foam, remainder of 2x6 cavity with open cell spray foam, sheetrock.

Asked By JOSEPH POLAND | Jun 1 13
2 Answers

Cost-effective flooring over slab?

Our in-laws have an slab foundation and wood flooring mostly -- but not in the entryway -- leaving a 1 3/4" elevation difference. To make it more wheelchair accessible, we would like raise the entryway floor elevation to more closely match the wood floor.

Asked By Patrick Walshe | Jun 1 13
1 Answer

Root cellar construction advice -- concrete additive?

Hello! This summer we are building a greenhouse addition with an underground root cellar attached. In one of the root cellar books I read, they recommend Everdure Caltite as an additive in concrete to make the foundation waterproof. What are your recommendations?

Asked By Leah Marshquist | May 31 13
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