Insulation is any material used to slow the transmission of heat or reduce the transmission of sound. Typical materials include fiberglass, foam, blown cellulose, and reflective foil. This should not be confused with weather stripping.

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What is the minimum thickness of foam board when insulating a basement

What is the minimum thickness of the foamboard insulation that can be used when insulating a concrete basement wall when it comes to moisture control and temperature control? Obviously thicker is ...
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0answers
14 views

Applicability of cellular shades in a sunroom

I'm trying to keep my sunroom/solarium with a sloping ceiling cooler in the summer and warmer in the winter. Cellular shades seem like a good approach, but hard data is tough to find on the web - I've ...
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1answer
40 views

help with improving HVAC performance on the second floor of an old house

I'm hoping some of you can offer some advice on how best to add a second AC in our home -- or on whether we should look for a different solution. I should say upfront that I've done a lot of reading ...
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1answer
44 views

Replace insulation in a Trane HVAC? (TWE030C140B0)

I found a little mold on the foil covering the insulation in my TWE030C140B0 air handler/ AC/Heater. I am 95% sure I have the moisture problem resolved and now I need to replace the insulation. Does ...
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1answer
897 views

What type of insulation should I use if my in-wall oven is heating the surrounding cabinets?

We have an in-wall oven that is not properly insulated. It heats up the surrounding cabinet. The oven itself has internal insulation in good condition, but it is not strong enough to keep heat ...
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1answer
11 views

Attach XPS to back of stud framing?

In the basement that I'm finishing I have an irregular, rough stone foundation wall, pretty dry. I'll use 1" XPS foam insulation, then drywall. Can I build the framing on the floor, attach the XPS to ...
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1answer
54 views

How can i stop heat

I live in a shop with my boyfriend, upstairs like a loft. We put up installations. We have an air conditioner running all day, but the room still gets too hot. No windows, just one huge door. What ...
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1answer
55 views

Insulation over ceiling drywall nailers or scabs

So fiberglass batts 12" thickness. The goal is to not let the insulation become compacted or have gaps between unconditioned and the conditioned space. When a drywall nailer is fastened to the top ...
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2answers
51 views

Mold and an insulated shed roof

Thanks in advance for any answers. I have just had a shed installed which is built onto the side of our house. It has a metal roof, with OSB board under it (there are wooden noggins to support it). ...
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1answer
20 views

How to prevent moisture from ruining a climate-controlled wooden outbuilding

We are having a 16 x 24 x 8 wooden outbuilding built. We are making a home gym that will have a cooling/heating unit for climate control. We are worried about moisture causing damage. Looking ...
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1answer
59 views

How to insulate flat part of attic ceiling?

I have a large (860 sq. ft.) attic that is uninsulated. I'm planning a project now to turn this into a TV room, so I'll need to insulate, run electrical, put up drywall, etc. An insulation company ...
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2answers
418 views

Can I block a skylight during summer without condensation?

I have a small fixed skylight and figure that during winter it's no problem to block the tunnel at ceiling level as suggested by an answer to a similar diy.stackechange question. (The only difference ...
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1answer
34 views

Foam board insulation over drywall

Guys I am living in a 500 sq ft apartment built in the 1950's and it has a south facing wall. I run the 10000 BTU AC almost 24/7 and in the afternoons the wall is very warm if not hot to the touch on ...
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1answer
15 views

Skylight insulation preventing heat gain

I have 6 - 4'x8' skylights in my showroom roof. its great for the winter but in the summer it radiates heat and glare into my showroom challenging my AC. I have had shade clothe as a cover which ...
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2answers
7k views

How to seal between sill plate and foundation wall with wide gap?

Here is a picture of the top of my uninsulated basement wall. The foundation is poured and from early 1970s. For orientation to the photo: the white in the lower left corner is the vertical face of ...
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1answer
472 views

Should I install drywall or plywood above a drop ceiling to increase the insulation value?

I am currently insulating a new room in my house. I am planning to put up a drop ceiling. I have insulated between my roof trusses. Do I need anything else between my drop ceiling and attic space ...
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1answer
78 views

Attic Insulation

I have Insulated AC flex duct work in my attic. Am I correct in that since its insulated already if I lay insulation over the duct work it is fine as long as the duct work is sealed properly? I have ...
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2answers
433 views

How can install rafter baffle venting without removing drywall?

I have a finished attic, that needs to be updated. The pitched sides of the roof are sheetrocked & insulated, the ceiling is a suspended ceiling (will be sheetrocked) and the low knee walls are ...
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1answer
97 views

How to seal the exposed top of glass block windows

My basement has some glass block windows, that seem to be improperly (or not-optimally) installed. See picture.... As I understand it, there should has been a perimeter channel attached to framing, ...
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1answer
129 views

Old cellulose insulation holding heat during summer

We have a house in Seattle that is 60 years old with 6-8" of blown in cellulose insulation in the attic with an inch of rock wool under that. There is basic ventilation in the attic. The trouble we ...
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4answers
44 views

Can't friction fit insulation

I have interior walls that are 24OC and I'm insulating them with 15.5 OC Denim/Cotton batts (they don't make a 23/24" version of this insulation) Because they're interior, normally a friction fit ...
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1answer
144 views

What is the Source of the Approximate “R Value” Chart?

There is a Chart labeled Approximate "R Value" of Walls, Windows, Ceiling & Floor in one of the responses to the question How can I measure the r-value of a wall? What is the source of this table?
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4answers
30k views

Why is one bedroom always colder than the rest of the house?

We have a two story home with 3 bedrooms upstairs. Home is 7 years old. One of the bedrooms is always around 5-6 degrees Fahrenheit colder than the rest of the house (when compared to the thermostat ...
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1answer
18 views

How to clean insulation foam residue off metal

How can I clean insulation foam ("Great Stuff" from Home Depot) off sheet metal ?
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1answer
41 views

What should I use to seal the hole where my central air enters the house?

Wood foundation house with vinyl siding. The hole that was made to allow the lines for my central air conditioner to enter the house is basically wide open - the silicone/caulking that was around the ...
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4answers
115 views

How can I add thermal mass to my house?

We're part of a real-time pricing program with our electric utility company, and a good strategy for offsetting electricity use during peak demand times is to pre-cool the house. The more thermal ...
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2answers
48 views

Is garage door insulation beneficial in South Florida?

I'm in South Florida and I have a west exposed garage door. The garage door is metal (possibly aluminum). The garage is not air conditioned. There is insulation between the house and the garage. There ...
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4answers
5k views

Should I replace my house wrap when re-siding?

My house was built in the 60s and doesn't have normal plywood sheathing. It has that old sheet-rock-like sheathing (it's black, I think it is exterior gypsum). Basically the walls (right now) go, ...
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0answers
33 views

Can I install batts under rafters in partially obstructed knee wall space?

I have an unconditioned knee wall space. I wish to condition it but am faced with a small dilemma. My concern is: can I install fiberglass against the rafters (assuming I have baffles), if the ...
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2answers
67 views

Mouse coming through gap around gas pipe

I found some mouse droppings in a cabinet yesterday, I'm not very handy but best I can tell is the following - There is a weep hole outside, which is maybe 1 centimeter wide wide, and it seems the ...
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1answer
37 views

What to do with cinder block holes made for electrical boxes?

The previous owners (flippers) left a surprise behind the drywall in my basement, and it was not just the absence of insulation. What is the best way to work with these holes? I want to replace the ...
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3answers
46 views

Reversing an inswing door to an outswing door? [duplicate]

I about to tear out and rebuild a portion of an exterior wall in which I will be installing a door, is it possible since it's new construction to purchase and inswing door and convert it to an ...
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0answers
21 views

How to repair exposed exterior foundation insulation?

Thanks for checking this question. New to owning a home, and new to stack exchange. I do not know where to begin and I do not know what "terms" to use when googling. Any tips/ideas how to repair or ...
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2answers
211 views

Is there long-term off-gassing from polyurethane closed-cell spray foam insulation?

We already installed Quadfoam 2.0, a "two-component, 2 lb., closed cell, spray applied, rigid polyurethane foam system" under the roof of our house, between the rafters. We read the manufacturers ...
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2answers
44 views

Is it a good idea to cap fiberglass batts with blown cellulose?

I currently have fiberglass batt insulation of about 6 inches (in some spots less than that closer to 3 inches) due to a cleanout necessitated by rodent activity which has been hopefully remedied. I ...
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2answers
142 views

How Do I Insulate My Bathroom Floor?

I'm renovating my bathroom and I need to insulate the floor. It's a concrete slab with 2x4 joists set on one brick piers. The home was built 50 yrs ago. There was no insulation at all in the floor. ...
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0answers
48 views

Creating 1" Air Gap between foundation wall and fiberglass batts

We just bought a house in Calgary, AB, Canada and noticed that the basement is below grade and is insulated with fiberglass batts. There is no drywall at the moment; hence, I have access to the vapor ...
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1answer
48 views

How Much Attic Insulation? (R-value vs Ceiling Bowing)

I'm preparing to insulate my attic and need to know how much is necessary and how much weight the ceiling can support. I live in San Diego (mild/warm climate). The house was built in 1969. ...
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2answers
324 views

Gap between 6“ dia wall thimble & 6” hvac pipe

I bought a 6" dia aluminum wall thimble to vent my 6" dia hvac steel exhaust pipe through to the outside. However, the diameter of the 6" thimble is actually 6 3/4". How do I effectively insulate the ...
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3answers
96 views

How should I insulate my workshop

I have a 20x14' workshop in my backyard. When I had it build, I had the installer place rigid insulation form under the concrete slab but everything else was not insulated. Since then, I've ...
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2answers
162 views

Is insulation around a dryer vent hose safe?

I live in an old apartment which does not have laundry, or even laundry hookups. Since I despise laundromats, I took it upon myself to get a portable washer which connects to a sink, and a portable ...
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6answers
2k views

Wind from kitchen sink drainage pipe

We live on a windy coast of North Sea. High wind is a norm here. One of the problems I face with the wind: it comes out from kitchen sink drainage pipe. If it is blowy outside, you can feel a draft ...
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2answers
39 views

Mounting exterior shutters on deeply recessed windows

I want to mount shutters on my 1930's house, but since we've had it insulated with polystyrene, the recess is 7 inches. That would need a huge offset hinge!! The windows are metal-cased woodframed ...
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0answers
26 views

Is silica gel used for insulation in walls/floors/ceilings?

Silica gel has great insulating properties (video). Is it used for home insulation? If yes, which products are available?
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7answers
29k views

was in attic for an hour without mask. could this cause issue?

my bathroom fan was dropping water so i went up to the attic and applied fiberglass insulation to the bare metal vent pipt from the fan out to the roof. i was up in the attic for an hour wearing ...
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8answers
15k views

How do I remove blown in attic insulation?

I want to replace the drywall ceiling in my house. It's old and has been painted over a million times. Home was built in the 50s. How do I replace the ceiling without replacing the insulation? Or if I ...
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0answers
30 views

Installing moisture/weather barriers around home/ doors and windows

What is the proper way to installed moisture/weather barrier around doors and windows in southern Louisiana?
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57 views

Asbestos? What do you think?

I originally thought so, but now I'm not so sure. Thoughts? It was located around HVAC vents.
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1answer
67 views

Vented soffit under bay window

Background: A bay window has been having ice dam issues for the past couple of years. I think the water is coming in through the space between the gutter and the fascia. That space is just on the ...
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2answers
118 views

Should I bother to flip basement ceiling insulation that's on backwards?

the rolled faced insulation on the ceiling of my unfinshed unheated basement is on backwards(vapor barrier facing down instead of up towards the 1st floor),1st floor is uncovered hardwood. Insulation ...