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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cooling and heating

We have A RASTRA built homeuilt in 2007, we purchased two years ago. We purchased a new HVAC system, all new windows and slider, but it is still super hot in the summer and cold in the winter, ...
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18 views

Can I leave Roxul Safe'n'Sound insulation exposed in a furnace room?

Hopefully someone has experience with this insulation. We are finishing off our basement. We have one long interior wall that will separate a family room from a furnace/storage room. The family ...
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28 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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2answers
60 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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32 views

noise vibration happening everyday except saturday night

A few months ago, a low bass noise started and vibrates slightly the house. It started not too loud and since 2 weeks it got louder and constant except Saturday night. It does not let me sleep as ...
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9 views

How to install rigid foam installation w/radiant barrier under a cathedral ceiling?

I'm in the process of insulating my shed-turned-office. I've installed typical fiberglass insulation in the walls, and currently have some 8x4 sheets of rigid foam insulation tacked to the bottom of ...
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2answers
433 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
43 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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3answers
293 views

What's the right approach for insulating the slab & footings underneath a masonry fireplace/heater?

The fireplace will be located in the middle of the concrete slab (away from the foundation stem walls) so it will have its own footing. My impression is that footings should rest on soil & gravel ...
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23 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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1answer
14 views

Spray to keep blown-in cellulose insulation from drifting?

I have a hip-roofed garrison colonial in New England, with blown-in cellulose. I have two whole-house fans ("half-house fans"?), and to give enough attic venting I have continuous soffit vents on all ...
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19 views

Interior vs. exterior A/C insulation

I recently got a new central a/c system with ducts included. PROBLEM: The ducts had interior insulation that gave off maple syrup odor. The contractor replaced the ducts with more interior insulation,...
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4answers
26k views

Should I drywall and/or insulate my garage wall?

I'm in the process of a few projects in the garage, including raising the ceiling and insulating with spray foam. This has left me with a fair amount of leftover fiberglass batts. There is a room ...
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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
21 views

Roof Ventilation and Insulation - Midwest - Gable and Ridge vents only, no soffit vents

I have a 1920's home in Ohio, and have NO soffit venting in the house. There are 2 gable vents, with one small temp-controlled fan (set to turn on ~95 F or higher). There is also a ridge vent. The ...
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1answer
83 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
452 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
102 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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2answers
22 views

Do I need a moisture barrier when insulating a metal roof with compressed Styrofoam?

I have a cabin with a metal roof and plywood underlay and want to use compressed Styrofoam to insulate between the rafters. Do I need a moisture barrier and how would I install this?
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25k views

Should I encapsulate my crawl space?

Our home was built with a dirt crawl space that is about 2' from ground to bottom of floor joist. The floors are insulated with fiberglass held up (where it hasn't fallen down) with wire rods. The AC/...
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1answer
25 views

New crawl space fiberglass insulation - Strong odor

We just had fiberglass batt insulation installed in the crawl space under our house. There is a strong odor coming from the crawl space that was not there this morning before the work was done. I've ...
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1answer
46 views

Should I cover area where ceiling once was?

I'm in the process of converting a 10'x11' bedroom into a master bathroom. I plan on removing the ceiling soon and it will be replaced when the drywallers come in a month or two. My question is, ...
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1answer
151 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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1answer
73 views

How should I insulate my shed to avoid mold and mildew?

I'm having a 16 by 12' shed built on-site because of difficulties getting down my driveway. It's to be a woodworking shop to build small furniture in. I live in Beaufort SC. It will have cement lap ...
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2answers
68 views

Is exposed Roxul insulation safe?

My basement is not occupied and I would like to put Roxul insulation against the windows so it adds a bit more insulation in the winter. The material I plan to use is Roxul, my question is would it be ...
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2answers
848 views

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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17 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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44 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
46 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
1k 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
14 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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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
57 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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67 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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484 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
133 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
48 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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4answers
31k 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
25 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
47 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
127 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
51 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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34 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
80 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
42 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
55 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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25 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
262 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
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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 ...