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0 Answers

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Asked By Yorikcilt Yorikcilt | Jan 20 17
10 Answers

Solar powered crawl-space dehumidifier?

I live in Texas where the humidity in the summer can be quite high and where the use of crawl space vents can be counter-productive. I have installed a vapor barrier over the crawl-space soil and have blocked all the crawl space vents.

I have been exploring the possibility of of using hot attic air in conjunction with a silica-gel based dehumidifier to lower the humidity in the crawl space. The idea is to circulate the crawl space air over thin beds of silica-gel during the evening to absorb excess moisture.

Asked By James Houston | Nov 8 16
1 Answer

Fujitsu Duct type halcyon inverter

Recently I had a duct type halcyon inverter installed. One unit is in the attic and the other in the basement. As I have read, you already addressed the issue of the indoor units set at the factory to read the temperature instead of the thermostats. This may have been a good idea with split units, but the attic unit was working too hard and the basement unit not hard enough. That was fixed when myself, and later the installer, found out that the thermostats are set at the factory to allow the ducted units to determine the temperature. After a few calls we were able to change that.

Asked By Peter Sampieri | Jan 19 17
7 Answers

Could you moderate first posts to stop the flood of spam?

Recently, I haven't been reading the Q&A on GBA, because it's always full of spam. Could I suggest that you moderate the first several posts by any non GBA Pro user who hasn't posted before? The idea being that you either have to pay for a subscription or post three moderated and approved posts before you get unfettered access to the forums.

Asked By John Ranson | Jan 19 17
5 Answers

Fiberglass and Cellulose performing differently in attic

In our vented attic, we specified 18" of blown-in cellulose. In one particular location, the insulation contractors were called back to redo an area that was not covered. When it got cold outside, I noticed that the ceiling in that area was noticeably colder than in other areas. Suspecting that the insulation contractor didn't actually fix it, the builder and I went to the attic today to check. They had attempted a fix. Instead of putting cellulose in the problem area, they had installed fiberglass batts. The batts looked to be about the same thickness as the cellulose.

Asked By Reid Baldwin | Jan 17 17
0 Answers

Mixing wall types (CMU and wood framing), comfort and acoustics?

HI all,

I'm considering a renovation/extension on a house built slab on grade with CMU walls in Austin, TX. The house was built around 1950, and the CMU block is pretty dense, much higher fill than modern CMU.

The plan is to use a "perfect wall" approach adding insulation/weather/rainscreen/siding outside the block. Think at least Pretty Good House insulation levels, perhaps PHIUS2015+.

Asked By James Howison | Jan 18 17
3 Answers

Wet brick

I am a builder completing a renovation to a late 19th century Victorian house outside Boston. I have noticed that the brick foundation looks wet even after a prolonged period of dry weather. This mostly appears right at grade but have noticed spots above grade, as well.

Asked By Nick Bennett | Jan 18 17
1 Answer

does part of attic that covers deck need to be insulated to prevent frost buildup?

the attic over the rest of house is insulated with vapor barrier and doesn't have frost buildup. What needs to be done to prevent frost in attic area over open deck?

Asked By Linda Walker | Jan 16 17
5 Answers

Florida Shed With A/C, Insulation, Vapor Barrier - Please help!

We are planning to buy a 12 x 24 pre-fab portable building like the Lofted Barn at

We live in southwest Florida and need to air condition it 365/yr (pretty much). Going to use the building for our handmade soap workshop and humidity is very important to our soap curing process so we will be using a portable dehumidifier in the space in addition to a wall a/c.

Asked By Ron Taylor | Jan 16 17
1 Answer

air sealing and insulating upto chimney?

Hi guys!

I'm looking for some advice on insulating and air sealing near a fireplace and chimney in my house (zone 6a). The chimney is unlined and the furnace and water heater are vented up chimney. I'm not going to use the fireplace as is, but I'm planning to put in a wood burning stove insert at a later time. Looking at the attached pictures, do you have ideas on how to air seal the space between the right of the chimney and the framing. Can I fill this space with mineral wool insulation? For the rest of the house I used mineral wool with membrain. Thanks, I appreciate any help!

Asked By Betina Chaon | Jan 16 17
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