Steel panels between studs for fire break instead of drywall?
Ann Lane
3 years ago
Featured Answer
Sort by:Oldest
Comments (51)
3onthetree
3 years agolast modified: 3 years agoAnn Lane
3 years agolast modified: 3 years agoRelated Discussions
How to secure wall studs in a basement...?
Comments (19)mat r Poly covered batt insulation in the basement walls can fail in as little as a year, saturated with trapped water vapour feeding mould in the drywall. (See brewbeer's link above.) The bottom plate does not deform when it's on top of XPS. Just score and snap sections wide enough to fit under the plate. (I used to use Super 6 vapour barrier; this keeps vapour from wicking up, but doesn't do anything if you get standing water.) XPS between the studs isn't ideal, but it sure beats most anything else. If there is space between the foundation wall and your stud wall, it would be better to slip in even half inch sheets along the wall. In that case, and that case only, you could safely use batts on the warm side of the basement wall with or without a facing. Just slitting the facing on the batts and putting them in by themselves is inviting trouble. (Following "best practices" at the time, I used to put a poly sheet on the concrete wall and leave it loose at the bottom; the idea was that the moisture on the wall would roll down and somehow get into the room and evaporate. A lot of hoping! And by slitting the warm side barrier, you'd be counting on the vapour going through the insulation, condensing on the warm side of that same poly and running back into the room as water. Long term, I bet it will fail too.) Above grade, Building Science Corp. says unfaced batt insulation is acceptable. (See Link above.) Electrical boxes. Just mount them on the 2x4s as on any interior wall. Do not attach the 2x4s to the walls; use plates (2x4 laid flat) top and bottom. If you have a concern about the wall thickness, you can use 2x3. Or even 2x2 light steel; but only where there is XPS on the wall and as little air movement as possible, as the steel will condense any water vapour that gets into the wall. Number of fasteners for the floor plates--every three to four feet. While XPS is my preference, Building Science Corp. says that EPS is also acceptable. But it has a lower R value per inch. Finally, be sure to provide mechanical dehumidification during the summer months to keep the moisture levels down. If I were to treat the walls first, I would use a permanent product, preferably a crystalline waterproofer in a slurry coat....See MoreFire-breaks in downstairs additions
Comments (19)As a code "wonk", I am not only interested in the code requirements and how they are applied to the buildings I design but in their purpose. I suppose that is because I spent 7 1/2 years in school before getting a job designing buildings and then no one wanted to do the code analysis work so I've been doing it for the past 40+ years. For anyone who cares: "Fireblocking" is intended to prevent the passage of hot gasses through wall cavities (between studs) from one floor to another and from the wall cavities to a ceiling cavity. Therefore, it usually occurs at the ceiling line and never occurs below that point which should be obvious if you think about it. Firestopping has nothing to do with fire separation of spaces or fire protection of structural elements - that involves the use of tested/rated assemblies to prevent the spread of fire vertically and/or horizontally through walls and floor/ceiling assemblies in a building and to prevent the premature collapse of the structure before people can get out. Draft stops are for the purpose of preventing the spread of fire within very large ceiling cavities. This requirement rarely applies to residences and never applies to walls. The requirement in national building codes for fireblocking goes back to the early 70's in the Uniform Building Code and to the early 80's in the first dedicated 1 & 2 family dwelling codes published by CABO (later renamed the ICC). It was in 2000 that the ICC was formed and the first International Residential Code (IRC) was published. These codes (and the previous CABO codes) required fireblocking in walls at floor/ceiling lines but did not specify how to deal with "furred" wall spaces (when horizontal strapping is applied to studs before a wall finish is installed allowing air to move horizontally along a wall behind a finish like drywall). The 2003 IRC corrected this oversight by adding the requirement that horizontal furred spaces be fireblocked horizontally at leat every 10 feet (along the wall) which was the original requirement of the Uniform Building Code (UBC) back in 1970. (I told you I was a code wonk.) That was the code I used to take the registration exam in '71 so I know it very well. To me, the notion that a building inspector would require fire blocking in the middle of a wall because it was taller than 10 ft. would be proof that the inspector did not understand the purpose of fireblocking and had not participated in the evolution of the that particular building code requirement and did not understand the current IRC requirement. Imagine that, a building inspector who did not understand the building code. Where is Manhattan42 when we need him? Building codes requirements are not optimum building techniques or guides to good construction; they are minimum standards to be met and hopefully exceeded. If you do not understand the purpose of building code requirements you will never be able to design over and above them - that is the most valuable design lesson that I learned from Walter Gropius, the Dean of my architecture school so many years ago. Thanks Grope, I miss you. Everything was so clear then....See MorePlaster vs Drywall for soundproofing
Comments (8)I can think of no advantage of plaster over drywall except hardness of the finish and there are more important issues involved. The separation wall between the two units must have a fire-resistance rating and that is much easier to obtain with drywall. Here is the code requirement: "R302.3 Two-family dwellings. Dwelling units in two-family dwellings shall be separated from each other by wall and/or floor assemblies having not less than a 1-hour fire-resistance rating when tested in accordance with ASTM E 119 or UL 263. Fire-resistance-rated floor-ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing." That means the wall assembly must have been tested by an agency like UL have have a published test number. These tests are expensive so there are few that are for metal lath and plaster. If the studs are wood, in bearing and don't contain plumbing, etc., the UL test number will be U 300 and U 399. The 1 hour rating can be achieved with a layer of 5/8 Type X drywall (U305). For metal lath and plaster, the the lath would need to be 3/8", 3.4 lb per sq. yd. diamond mesh expanded steel and the plaster would need to have a scratch coat of 2 c.f. of vermiculite aggregate to 100 ibs of fibered gypsum and 100 lb. of unfibered gypsum for the brown coat. (U315). The approved manufacturers of the materials used for each of the tested assemblies are listed for each test. there many more tests for drywall than for lath and plaster. It would be far cheaper and easier to construct and get approval for a drywall assembly with no loss of fire protection or sound separation. To improve the sound separation with drywall (I don't how to do it with plaster) add another layer and perhaps hang it on horizontal resilient channels. Seal the perimeter well and avoid back to back electrical outlets or other penetrations. It can help if one side is different from the other. There are many alternate ways to increase sound separation but the 4 principles are: 1. mass - the heavier and thicker the materials the better 2. resiliency - materials that move with the sound reduce it's energy 3. absorbency - materials that are porous slow and trap sound 4. no cracks - cracks and doors defeat the other principles To get the hardness of a plaster finish with the advantages of drywall you can use a veneer plaster system (blue board) if it is available in you market. It's just a thin coat of plaster on a special drywall board and far superior to taped drywall usually at no additional cost. This post was edited by Renovator8 on Thu, Feb 21, 13 at 9:39...See MoreLet’s gut “the Motel” to the studs
Comments (332)Hey team! I desperately need help. There are no stone masons in the area of my cabin, apparently, so I have to design my front steps myself. There is a quarry that will cut and deliver custom sized stones, but the excavator who dug our foundation will have to place them. That means minimal site prep and accuracy. For that reason, I thought to do just two stones, the bottom one big enough to support the entire top stone. As you can see, the front is very simple, and could use the beauty of some really great steps (and I'm thinking one long window box on the left and another around the corner to the right of the porch), but the ideal size is killing me. Should they be really wide? Wider than the door trim? If the top step is almost at the height of the door, should its run be longer than a standard run? so you can easily step out onto it before descending? The height from ground to sill is 17", the width including trim is 43" I could do 1-2 much wider stones as the base, creating a step that goes unnecessarily in all directions but gives a wider look to the entry, or I could make both stones the same width, whatever that should be. HELP! I"m embarrassed by how it looks unpainted: it will look MUCH better all painted the same dark brown (see the partially painted side for reference)....See MoreJeffrey R. Grenz, General Contractor
3 years agoAnn Lane
3 years agoMark Bischak, Architect
3 years agolast modified: 3 years agoMark Bischak, Architect
3 years agoAnn Lane
3 years agoworthy
3 years agolast modified: 3 years ago3onthetree
3 years agochispa
3 years agoAnn Lane
3 years agolast modified: 3 years agoJoseph Corlett, LLC
3 years agoMark Bischak, Architect
3 years agochispa
3 years agoAnn Lane
3 years agoAnn Lane
3 years agoMark Bischak, Architect
3 years agoAnn Lane
3 years agolast modified: 3 years agoMark Bischak, Architect
3 years agoJeffrey R. Grenz, General Contractor
3 years agoAnn Lane
3 years agoRon Natalie
3 years agoAnn Lane
3 years agoAnn Lane
3 years agolast modified: 3 years agochispa
3 years agoAnn Lane
3 years agolast modified: 3 years agoAnn Lane
3 years agoMark Bischak, Architect
3 years agoworthy
3 years agolast modified: 3 years agoBruce in Northern Virginia
3 years agolast modified: 3 years agoMark Bischak, Architect
3 years agomillworkman
3 years agoAnn Lane
3 years agolast modified: 3 years agoworthy
3 years agolast modified: 3 years agomillworkman
3 years agoMark Bischak, Architect
3 years agofissfiss
3 years agoAnn Lane
3 years agoMark Bischak, Architect
3 years agoworthy
3 years agolast modified: 3 years agores2architect
3 years agores2architect
3 years ago3onthetree
3 years agoJean
3 years agolast modified: 3 years agojust_janni
3 years agoJeffrey R. Grenz, General Contractor
3 years ago
Related Stories
DESIGN DICTIONARYSteel Stud
This steely version of the wood stud can frame a home with a few extra benefits
Full StoryDECORATING GUIDESQuick Fix: Find Wall Studs Without an Expensive Stud Finder
See how to find hidden wall studs with this ridiculously easy trick
Full StoryHOUSEKEEPINGHow to Clean Stainless Steel
Protect this popular kitchen material with a consistent but gentle cleaning routine
Full StoryMOST POPULAR9 Real Ways You Can Help After a House Fire
Suggestions from someone who lost her home to fire — and experienced the staggering generosity of community
Full StoryGREEN BUILDINGGoing Solar at Home: Solar Panel Basics
Save money on electricity and reduce your carbon footprint by installing photovoltaic panels. This guide will help you get started
Full StoryGREEN BUILDINGThe Big Freeze: Inventors Break New Ground to Keep Things Cool
Old-fashioned fridges can be energy guzzlers, but there are more eco-friendly ways of keeping food fresh, as these global innovations show
Full StorySTORAGETap Into Stud Space for More Wall Storage
It’s recess time. Look to hidden wall space to build a nook that’s both practical and appealing to the eye
Full StoryPATIO OF THE WEEKWater and Fire Mingle in a Canadian Front Yard
If the illuminated moat winding through this Ontario patio doesn't dazzle you, the 8-foot-wide fireplace will
Full StoryECLECTIC HOMESHouzz Tour: Renovation Breathes New Life Into a Fire Station
A decommissioned fire station becomes an energy-efficient, clean-lined home with a separate apartment
Full StoryHOUSEKEEPINGQuick Fix: How to Patch a Drywall Hole
Dents and dings disappear, leaving your walls looking brand new, with this fix that even a novice can do
Full Story
cat_ky