31 votes
Accepted

Why do I have Insulation in internal wall between two rooms?

It was probably installed to reduce sound transmission. It's common to see materials that are more dense than fiberglass used as acoustic insulation, but fiberglass is used as well. The sounds of ...
isherwood's user avatar
  • 135k
9 votes
Accepted

How do I know if my subfloor is fire retardant or preservative-treated?

The concern is probably that adhesives won't bond to treated plywood, or maybe that color will leach out and stain the new flooring. You're right that you're seeing paint overspray on your subfloor. ...
isherwood's user avatar
  • 135k
6 votes

How do I know if my subfloor is fire retardant or preservative-treated?

That looks like good old plywood decking. No obvious treatment there.
Ed Beal's user avatar
  • 103k
6 votes

Why do I have Insulation in internal wall between two rooms?

Around the bathroom, it is most likely for noise isolation. Usually the material used in this application is different from standard fibreglass batts. I've used Roxul AFB in this way before. It is a ...
William H.'s user avatar
6 votes

Why are fire sprinklers and extinguishing systems failing?

If you're not from the wildfire west, it's hard to get it. This isn't a dumpster fire, it's a firestorm. You might as well be putting the building in an autoclave and expecting it to not burn. ...
Harper - Reinstate Monica's user avatar
5 votes
Accepted

Fire door modification beyond trim allowance

How likely is it that this would be signed off by Building Control? Highly likely. The way you describe the carpenter's modification proposal it would likely not be easily detected. If it was signed ...
Jimmy Fix-it's user avatar
  • 35.3k
5 votes

Are both layers of a drywall firewall required to be taped separately?

Fire rated wall or ceiling assemblies have fire ratings. Sheetrock, even type X, ("fire code" so called) does not have a rating, outside of being used as a component in a rated wall or ...
Ecnerwal's user avatar
  • 211k
4 votes

How one is supposed to "plug" a conduit running from basement to attic?

Duct seal is another option. Duct seal is a dough-like product that often carries some form of fire rating (depending on manufacturer specification) and it remains flexible.
statueuphemism's user avatar
4 votes
Accepted

Running outlets in or on a garage fire protection wall

It's likely you're overreacting. First, find out if your current situation is a fire hazard, a question that's probably best answered by your local building inspector. She/he will know your local ...
FreeMan's user avatar
  • 47.1k
3 votes

What "equivalent" to drywall can I use to finish a garage ceiling with habitable space above?

You could add access panels in the most useful places. Where the wall is above, anywhere a cable turns to go up the wall would be a valid spot for an access hatch. For a run of cable across to a ...
Criggie's user avatar
  • 10.5k
3 votes
Accepted

Fire Separation Wall - what should I use to seal small exposed openings?

Firestop - caulking or foam (there are other brands of both, just examples, not recommendations.) These are helpful because they will seal around a cable as it melts in a fire (they expand with ...
Ecnerwal's user avatar
  • 211k
3 votes

Is drywall "mud" a reasonable fire-retardant coating for foam?

It needs drywall. I can't find anything allowing anything else in a living space. Regardless of your inspector's allowance of paint, I certainly wouldn't do it for a bedroom. There are allowances of ...
Tiger Guy's user avatar
  • 1,843
3 votes

Is drywall "mud" a reasonable fire-retardant coating for foam?

Drywall mud, no. Not without drywall, first. Plaster, yes, if they wanted to do plaster. But if they hate the shape of the walls, not much point - drywall will change that quicker and cheaper than ...
Ecnerwal's user avatar
  • 211k
3 votes

Why are fire sprinklers and extinguishing systems failing?

First step: don't let the fire burn right up to your house The concept of defensible space in a wildfire-prone area is to make sure that there isn't a huge amount of fuel right next to the building ...
ThreePhaseEel's user avatar
3 votes
Accepted

full size wood mantlet (5 in+) 12 inches away from the fireplace openings top? US - TX fire code

"Not within 6 inches" "Within 12 inches, 1/8 inch projection per inch from the opening" So, 7 inches away, can stick out 7/8 inch 10 inches away, can stick out 1-1/4 inch 12 inches ...
Ecnerwal's user avatar
  • 211k
3 votes
Accepted

How one is supposed to "plug" a conduit running from basement to attic?

My favorite is to use a thin plastic bag and inject some fireblocking foam into the bag while it's stuffed in the open end of the conduit. That way it expands and plugs the conduit but the plastic bag ...
William S.'s user avatar
  • 1,031
3 votes

Is drywall "mud" a reasonable fire-retardant coating for foam?

I'm the first around here to shout from the rooftops the horrors and hazards (see the 13:00 surprise) of spray foam insulation. From the Sunshine Mine to Grenfell Towers to Browns Ferry nuclear plant, ...
Harper - Reinstate Monica's user avatar
2 votes

Does a self-adhesive membrane roof need a fire-proof layer?

"Fireproof netting"??? I've never heard of such a thing. If it's netting, then there are "holes" in it AND THEN ITS NOT FIREPROOF. The netting might be fire retardant, but it's not a fireproof ...
Lee Sam's user avatar
  • 23.2k
2 votes
Accepted

Firewall / Hearth thickness - Building Fireplace for Gel Fuel

According to the 2006 International Building Code Table 720.1(2). , 3-5/8" of brick is just slightly under the Fire Resistance Rating for 2 hours of a wall fire. On the other hand, a 3-5/8" brick wall ...
dberm22's user avatar
  • 424
2 votes

How can I fireproof a room?

It's hard to say anything useful without details... I'd strongly recommend hiring an engineer to advise you on this. Preferably one who works on laboratory safety, since that's the closest thing I can ...
keshlam's user avatar
  • 28.7k
2 votes

How one is supposed to "plug" a conduit running from basement to attic?

A bit of fiberglass (or any fluffy material you have on hand) stuffed in a plastic bag would provide both an air barrier and some insulation value. For an opening that small, that's all that's ...
isherwood's user avatar
  • 135k
2 votes

What can I use as a bowl for a DIY fire bowl/pit?

I came up with this in about an hour with stuff laying around my blacksmiths shop. Just happened to have a firebowl from a storebought pit. The tripod is made of 1/2" hot rolled square and the hangars ...
Matt's user avatar
  • 21
2 votes

Is drywall "mud" a reasonable fire-retardant coating for foam?

I've had to deal with that flame retardant paint for my attic insulation. If it's closed cell foam, what I understand is that it's not that the foam bursts into flames but that it puts out some really ...
aquaticapetheory's user avatar
2 votes
Accepted

How to fire block/draft block large gaps in the basement?

Fireblocking is required at 10’ on center both vertically and horizontally. (See R602.8) Acceptable materials are 2x material or 1x material with joints backed up, or one layer of 23/32 structural ...
Lee Sam's user avatar
  • 3,768
2 votes

Why do I have Insulation in internal wall between two rooms?

Thermal insulation between bathroom and the rest of the house is very relevant. Bathroom is a room which is expected to be sometimes used naked, contrary to the rest of the house. Which means that ...
Agent_L's user avatar
  • 1,670
2 votes

What "equivalent" to drywall can I use to finish a garage ceiling with habitable space above?

It still may not meet code but there are suspended ceiling systems where the drop in panels are firecode sheetrock with various textures on the surface. The link has one source, but with that you can ...
Jack's user avatar
  • 34.8k
1 vote

Fire proofing a garage door beam

If there is a living space above the beam, then you need to “protect” the beam and “wrapping”the beam with 5/8” gypsum board is one way of doing it. If it’s the garage attic above the beam, then ...
Lee Sam's user avatar
  • 3,768
1 vote

fireproof corner in basement?

We often design and build “safe rooms” in custom homes. Safe rooms have several requirements: 1) structurally secure, 2) fire protection, 3) temperature and humidity control, You are requesting ...
Lee Sam's user avatar
  • 23.2k
1 vote

R302.7 Under-Stair Protection - does drywall need to be below stringers or just treads and risers?

No, you can't leave the center stringer exposed. That would leave a path for fire through the drywall. You must create a continuous break, with all seams taped. I can't see an inspector flagging ...
isherwood's user avatar
  • 135k
1 vote
Accepted

How to fireproof steel beam in existing (45 year old) house

Adjacent houses had one of the nastier asbestos boards in the groove seen between the joists and under the metal. Then the regular plasterboard layer. Fireboard is what we put up in the same position, ...
Harold Faltermeier's user avatar

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