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.

learn more… | top users | synonyms

1
vote
2answers
484 views

Is a PTHP an HVAC option for a super or well insulated structure?

Is a Packaged Terminal Heat Pump a good HVAC system for a structure that is super insulated or passively insulated assuming the unit is sized and fitted to meet the needs of the structure. There is ...
1
vote
3answers
2k views

What options are available for insulating interior walls myself with minimal damage to the wall?

United State | California I'd like to insulate the interior walls in my house using a minimally invasive method. My understanding that is that "blown-in insulation" requires specialized equipment ...
1
vote
1answer
897 views

Will installing an OSB floor in the attic create moisture problems?

I installed some new OSB flooring in my attic. The area it covers is about 160 sq. ft. The total area of the attic is about 750 sq. ft. There is just blown fiberglass up there, and there is no vapor ...
1
vote
1answer
1k views

How do I insulate around conduits and into difficult edges in my attic?

I am thinking about adding a little over a foot of insulation to my attics. I understand that there shouldn't be gaps between fiberglass batts (I read that this can reduce efficiency by 25%, whatever ...
1
vote
1answer
307 views

What height of insulation should I use between joists in an MDF floor?

Background I am starting my first serious DIY project - converting our garage into a playroom for the kids. The garage floor is concrete. My plan is to run timber (Sawn Kiln Dried Timber (L)3000 x ...
1
vote
2answers
3k views

How can I seal around a light fixture/light switch outlet?

I Have a house built in 1972. I'm currently 80% finished in installing a ceiling fan into my master bedroom. I had an energy audit about a month ago, which revealed that I had "pretty good sealing" ...
1
vote
1answer
41 views

Do basement walls with metal framing and foam insulation require fireblocking and draftstopping?

Question: Do non-load bearing basement walls with metals framing and foam insulation (such as extruded polystyrene) in a single-family home require fireblocking and draftstopping? If so, what is the ...
1
vote
2answers
66 views

Bathroom above the Garage

Is it advisable to build a bathroom above the garage? What kind of obstacles might we face if there is a bathroom above the garage in terms of piping, insulation, etc.?
1
vote
2answers
59 views

after sealing the chimney, fireplace still not insulated

I found a way to use a large chimney balloon and pretty much block all downdraft. Sadly, the fireplace and hearth are still very cold, and it sucks heat out of the surrounding floor too. Perhaps the ...
1
vote
1answer
161 views

Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
1
vote
4answers
341 views

Best way to air seal, vapor seal, and insulate exterior wall in old house?

I have a 90-year old house in Seattle. Exterior walls are constructed as follows: lath and plaster, uninsulated 2x4 stud bays, plank sheathing, cedar clapboard, 1" foil-faced styrofoam, vinyl siding. ...
1
vote
3answers
344 views

Do I have to worry about condensation on plywood over rigid foam insulation in the attic?

I have a vented attic space with poor insulation in the attic floor and rafters, so I'm going to button it up. My energy auditor suggested I insulate the floor as follows: cut blocks of rigid foam ...
1
vote
1answer
321 views

How can I insulate a room without tearing down walls?

The kitchen in my Philadelphia rowhome seems to have been....a last minute idea. From last winter, I'm almost certain there is no insulation involved in the room. Is there a way for me to do something ...
1
vote
1answer
71 views

Where to attach a storm window?

We have two very leaky, single pane windows that we need to insulate. Because interior shrinkwrap storms are impractical for several reasons, we're looking at exterior storms instead. Home Depot has ...
1
vote
2answers
81 views

Bunch of insulation questions

I have the following situation. I have a raised ranch and we're having drain tiles installed. I wanted to use this time to install some additional insulation while we've got wood paneling down. The ...
1
vote
1answer
194 views

How do I stop the second floor of my house from being so hot in the summer and so cold in the winter

I have a window AC upstairs in the summer but it is not enough I can fell the heat coming off of the ceiling in the summer and in the winter it is way to cold that my kids have to sleep downstairs ...
1
vote
1answer
100 views

Type of insulation between exhaust flue and chimney flue?

We converted a wood stove to a propane fireplace. It's a direct vent but we're only using the exhaust insert. The intake air will come from the interior. Anyways, as such, we have a gap around the ...
1
vote
1answer
205 views

How does water supply enter into a pedestal house in cold climates?

I do a fair amount of traveling through West Virginia and other Appalachian destinations and I have noticed a number of pedestal houses (that stand on concrete piers, wooden posts or a combination of ...
1
vote
3answers
7k views

How should I use fiberglass batts to insulate between floor joists over a stone basement?

I have an old home built on a stone foundation. The stone foundation is solid, as well as the floor joists. I run a dehumidifier in the basement full time, to keep the air moisture low. There is ...
1
vote
1answer
285 views

How should I insulate behind the last floor joist that runs parallel to the foundation wall?

As an aside, I can't for the life of me figure out what to call the last floor joist that runs parallel to the basement foundation. Does it have a name? In my house, there is a little cramped gap an ...
1
vote
2answers
684 views

What are some cheap (and landlord friendly) ways to fix a drafty flat?

The worst affected seems to be my room. It is the end of the turret with a massive vent (now gaffa-tape sealed) I will be sitting by the wall and actually feel the freezing cold air against my neck ...
1
vote
2answers
203 views

How can I insulate a window against the sound caused by high winds?

I'm on the top floor of an exposed block of flats which is currently being battered by high winds on a nightly basis. I have draught excluders fitted but there's still a lot of noise that comes in ...
1
vote
1answer
421 views

When should I open a skylight vent?

I have a one-floor (plus basement) house with a large skylight in the living room. It has an openable vent. When is it proper to open the vent? Should I open it in midsummer with the AC on, on ...
1
vote
1answer
26 views

Replace portion of slab for radiant heat

Our 1600 SF basement has a slab floor with no insulation underneath. I'm redoing the bathroom (roughly 100 SF, with 7' along the foundation wall) and would love to put in radiant floor heating, but I ...
1
vote
2answers
22 views

Insulation type to use on a hinged metal attic door

In this question, I asked about the best type of insulation to use on a hinged metal attic door, when one is also concerned about heat entering around the edges of the door when closed. The answer I ...
1
vote
1answer
44 views

Cell Foam vs. Traditional Fiberglass Insulation for Party Wall

In an end-unit townhouse, cell foam is being used to insulate the three exterior walls. Would the gains from also using cell foam on the party wall be noticeable? Or would the cheaper alternative of ...
1
vote
1answer
43 views

How should I insulate an interior wall between a warm humid bathroom and a cold bedroom?

We're redoing the master bath. I'm wondering if and how I should insulate the interior wall. Bedroom is kept at 50F. Bathroom will be warm (radiant floor) and humid even if we have and run vent fan. ...
1
vote
2answers
73 views

Can I insulate flat roof using this method?

I just wonder if I can insulate my flat roof in northern India by following steps as under: Apply a cover of Bitumen Cover it with polythene (for water proofing) Lay used cement bags on polythene ...
1
vote
1answer
59 views

Looking for Second Opinion on New Insulation in Attic

I had someone come take a look at the attic yesterday to do an assessment. He uses the sprayable foam insulation and said that he would spray the ceiling of the attic rather than the floor (and remove ...
1
vote
1answer
70 views

Can I insulate PEX pipe in a crawlspace with fiberglass insulation?

I have PEX pipe hung under the floor joists in my crawl space. I am inclined to cut fiberglass wall insulation R-14 into strips and run it under the pipe.That will encase it as the floors are well ...
1
vote
1answer
38 views

How to fill an old window alcove?

In one of the bedrooms in my house (1930s), there is a sunken alcove where an old window used to be, the internal sill is still there. Whoever bricked up the window used bricks much thinner than the ...
1
vote
1answer
98 views

How do I apply foam board insulation behind a new recessed shelf in an exterior wall?

I want to make a recessed shelving in a exterior wall. When i took out the drywall, I found no insulation between the studs. Before I place the shelving parts, I want to put some insulation first ( I ...
1
vote
1answer
42 views

how to insulate very wide fireplace?

I want to air-seal my fireplace. The damper is 44" wide, and it's about 4 feet off the floor, not easy to reach. The chimney tapers gradually for several feet after that, a couple inches narrower per ...
1
vote
1answer
52 views

Foam Insulation

I recently had to partially rip out the dry wall and insulation from an inside wall that joins to the garage. The outside wall had a styrofoam layer to it. My tape measure says it's 1 inch thick. ...
1
vote
2answers
73 views

Does anyone have experience with insulating with waste-wool from shearing?

Does anyone have experience with insulating with waste wool from sheep-shearing. I am interested in washing and deodorizing techniques and also in the packing-density requirements. Plan is to use ...
1
vote
1answer
23 views

When insulating a new house does the poly have to be caulked and taped at the top?

How far down from the top of the wall does the poly covering the insulation have to be and does it have to be caulked at the top and bottom and taped?
1
vote
1answer
39 views

Fragile paperback on cellar ceiling batts

Installed in 1968, these insulation batts now fall, or hang. The paperback has become so fragile the insulating weight pulls it apart. What suggestions for a remedy? Replace? Or?
1
vote
2answers
272 views

Insulating near a breaker box

Hello: In remodeling my basement I have so far finished installing R-10 2" XPS insulation against my block walls. My question is: How close or how far away from the circuit breaker panel can I place ...
1
vote
1answer
64 views

Strip on side of window letting cold air in

My apartment bedroom window has a thin vertical strip along the right side that allows warm air from the room to escape. Even with the bedroom thermostat set to 80 degrees, the room hasn't gone above ...
1
vote
2answers
266 views

Should I install the exhaust hood outlet through the chimney or house wall?

What are the advantages and disadvantages of implementing an outlet of a kitchen exhaust hood through a chimney or directly through the outer wall of the house? There are unused chimneys in the house ...
1
vote
1answer
57 views

How do we properly insulate a loft ceiling with 2“ by 4” without loosing space?

We have recently started a home improvement project that involved completely redoing all of our vaulted ceilings. We have a loft area that was about 6 foot in height at the peak. When we did the demo ...
1
vote
2answers
2k views

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

I had a home built last year and we have one bedroom that is 6-10 degrees colder than the rest of the rooms in the house when its cold outside. The heat is radiant and the system has temperature ...
1
vote
2answers
73 views

How can I fill a gap beneath windows?

Outside my house, there is a gap visible below some of my windows. I have attached pictures to make it clear, since I don't know the terminology. The gap is about the width of my thumb. I can see the ...
1
vote
1answer
1k views

Do I need vapor barrier to insulate a cinder block garage?

Similar to How to properly insulate a garage? and Do I need a vapor barrier between the insulation and finish wall in a new garage? both of which do not have answers pertitent to my one particular ...
1
vote
1answer
2k views

What kind of insulation should we put under new tin roof?

We live in an old long leaf pine farmhouse that has no insulation in it. We are going to be putting a new metal roof on the house. The attic of the house was made into living space and so there is ...
1
vote
1answer
91 views

It is safe to insulate my uninsulated oven?

I have a Hotpoint gas range. I got it because it has no electronics and will probably last until the bombs fall and the ants and cockroaches take over. It is awesome, and cooks my food as well as any ...
1
vote
1answer
100 views

Vapor barrier for room next to garage?

I'm finishing a room that was built between the house and detached garage. I know I need to put 5/8" drywall for fire protection after insulating the wall. Do I also need vapor barrier? If so, how do ...
1
vote
2answers
222 views

Can insulation batts run on top of wall studs?

Our house has vaulted ceilings, and the attic space contains three walls that are shared with living space (bedroom and living room). The attic sides of these walls have batts of insulation on them, ...
1
vote
1answer
227 views

How should I install underfloor heating over OSB subfloor?

I need some help on my DIY project for underfloor heating system in an apartment. The question is on the screed requirements provided that I have the following (non traditional) setup. There is ...
1
vote
2answers
360 views

mesh net to help keep crawlspace insulation from sagging

Is it practical to install netting for crawlspace insulation to help keep loose insulation in place? If so how is it fastened to the floor joist and where can I find the netting?