Horizontal support structures beneath the floor running between load bearing walls.

learn more… | top users | synonyms

2
votes
1answer
131 views

Support for Tile floor

I have 2x8 (7.25x1.5) what appear to be doug fur or southern pine floor joists on 16" centers in a finished basement. I want to tile a master bath on the main floor. Joists span exactly 11' 4" from ...
2
votes
1answer
159 views

Floor joist attachment improvements in presence of existing ledger?

TL;DR: AFAIK there are no joist hangers that can be retrofit in a location where there's an existing ledger board without removing said ledger, right? Is there anything I should think about aside ...
2
votes
2answers
1k views

How to hang a chair from the ceiling joists (with attic access)

I'm planning on hanging a chair from the ceiling. From what I can tell the best method is to add a crosspiece above multiple joists, and mount the chair to that using an eye bolt. The problem with ...
2
votes
1answer
308 views

Can rigid foam board have an air space between it and rim joist?

I am insulating my rim joists with 2" rigid foam board. Most of the rim joist is bare, and the foam fits along it nicely. Some sill boxes have some small irregularities (vent pipes, plumbing, etc) ...
2
votes
2answers
2k views

Does this ceiling joist layout look structurally sound?

I plan on talking with an architect soon, but wanted feedback from this community too. Please see the attached photo. I'm in Raleigh, NC and am using information from this site (http://www....
2
votes
1answer
66 views

How important is the scoop cut in a drop-in joint?

I've been reading up on joints, particularly drop-in joints. Some of the drawings have a curved cut on the underside leading up to the tenon, sometimes labeled a "scoop cut". Curves make ...
2
votes
2answers
137 views

How do I find the studs on my ceiling through 4.5" of polyiso?

I am starting to install polyiso on the interior of my slanted cathedral roof assembly and am having trouble finding the studs through the 4.5" of polyiso that I have. Things working against me: ...
2
votes
1answer
1k views

How can I build a temporary support for rafters?

I have a hipped roof with 5.5 metre common rafters supported mid span by strutted purlins. The rafters, and below them the ceiling joists, are trimmed around a double flue chimney breast at the flank ...
2
votes
1answer
67 views

Will my existing deck support the weight of a new hot tub?

I have a hot tub on my deck. I'm ready to fill it but now wondering about the weight on it. The deck is 10' wide with 2x8 joists on 16"centers. The tub is 7' x 7'. When filled with water and people ...
2
votes
0answers
65 views

Will my garage truss and beam configuration be adequate for a room in the attic?

I am getting ready to finish some of the space above the garage and have some questions. I am located in Pittsburgh, PA. The garage is sloped on both sides down to the floor. I was going to utilize ...
1
vote
1answer
522 views

How can I support a joist length of 9 meters without steel?

I want to convert my loft and need to span 9 meters unsupported. Can it be achieved without steel beams?
1
vote
1answer
2k views

1“ x 2” Furring Strips for Drywall Ceiling

In my basement, there's currently a tile ceiling that's installed on furring strips attached to the joists. The furring strips are 1"x2", attached to the joists by nails. We're currently replacing the ...
1
vote
2answers
69 views

Why are top-mount joist and purlin hangers shorter than actual lumber dimensions?

Looking at the load tables for various products, purlin hangers are often shorter than the actual size lumber they're supposed to hang: USP JPF USP HL The size difference seems more consistent at ...
1
vote
2answers
5k views

HVAC Duct options in floor joists

I will explain what I would "Ideally" want. I would like the HVAC in the basement ceiling to Not require a soffit. Plumbing seems possible because the holes for the most part will be small enough to ...
1
vote
2answers
4k views

What is the strongest way to join a deck joist to a corner joint?

I'm working on designing the support frame for a deck for my backyard. The basic shape of the deck: It's essentially a square with one corner chopped off. The red line is the joist in question, ...
1
vote
1answer
52 views

Which nut/washer combination to join timber to timber (joist to rafter)

I am fitting some new joists in my roof and will be bolting the new joists to the existing rafters. Both joists and rafters are 47mm thick. After some advice from a friend (which may of course be ...
1
vote
2answers
79 views

Can I frame over an existing deck with a new deck to raise the level?

I was looking at below photo and realized they basically put the trim joists of the platform on top of the bottom joists / beam. Is that allowed? I thought you have to actually put footings for the ...
1
vote
3answers
3k views

Can I drill a 3 1/2" hole through 5 joists?

I need to move a toilet to the other side of room approx. 6 ft I will have to drill a 3.5 in hole for the waste line in 5 floor joist on the second floor. Can I double them and still drill the 3.5 in ...
1
vote
2answers
1k views

Is it ok to sister a joist to burnt joist?

I am about to purchase a house that was damaged in a fire and sitting for 4 years. The fire was mostly contained to a small area, but some joists were burned quite badly, while other just had some ...
1
vote
1answer
3k views

How far apart should timber joists be for 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
53 views

Mounting pull-up/exercise beam in corner above window

I'm considering mounting a beam for climbing exercise equipment similar to what is pictured below (see here for complete details): The set up (in my case) would consist of two 20" 2x8 base boards ...
1
vote
2answers
360 views

Is deck joist sistering a sloppy repair?

I have a few bad deck joists that I replaced with new PT joists. These repairs are great. Now I have a few more not too bad joists that will be rotted in a few years. I am thinking to add new PT ...
1
vote
2answers
83 views

How can I level the joists and ceiling?

I am presently renovating a house that has a 4" difference from the middle to the one side due to the subsidence. It is a semi-detached duplex, with 3 floors including the basement. The worst is the ...
1
vote
1answer
264 views

Can I replace a floor joist cross-brace with two horizontal pieces of blocking in the same spot?

I am doing some remodeling and want to run a 6-inch HVAC (kitchen exhaust hood) duct through the floor joists. There is one section where the path is impeded by a standard floor joist cross-brace. Can ...
1
vote
2answers
3k views

Can my floor support Kitchen Island?

I am installing a 5' x 3' kitchen island consisting of two base cabinets. Once I've installed the two base cabinets, SilestoneUSA will install a quartz counter top. My plan is to screw two ...
1
vote
1answer
3k views

Can I build a deck close to the ground? [duplicate]

Possible Duplicate: Can I build a deck this low to the ground? Every set of instructions I've seen for building a deck requires me to put joists on top of beams attached to posts. But I only ...
1
vote
1answer
334 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
1answer
56 views

Are there any restrictions for drilling holes in solid lumber joists regarding how close to the ends of the joist? [duplicate]

I've read to not drill a hole greater than 1/3 the depth of the board (I want to drill a 3/4" hole in a 12" board for wiring, so that won't be an issue) as well as not to do it within two inches of ...
1
vote
2answers
35 views

Do I need ledger board when expand deck?

I have a deck like below and I want to expand the direction where the arrow shows (sorry for an ugly photo). Do I need to put a ledger board right on the trim joist, or can I just hang the new ...
1
vote
1answer
84 views

Need to find out if this is a load bearing wall on my second floor

I have a desire to open up my second floor to make one big room (it's my bedroom and want a king size bed and closet). The room is currently split about 65/35 by a wall that does not appear to be load ...
1
vote
3answers
224 views

How can I repair the end of joists sitting in brick pockets?

I have 2x8 joists over an 8 foot span that were eaten by termites on one end. I need to repair all of the joists in a small room. The building is double wythe structural brick that is approximately ...
1
vote
1answer
109 views

What is the proper hole size to drill through joists for wiring? [duplicate]

I am running CAT6a wire around my house and I was wondering what the maximum hole size I can drill to run cable across the joists in my basement to various rooms. I should measure but the joists are 2 ...
1
vote
2answers
159 views

Misaligned floor joist hangers

What is the best way to resolve an issue with misaligned floor joist hangers? Our flooring in the kitchen is starting to dip and sag and it is directly related to the fact that the floor joists are ...
1
vote
1answer
332 views

Modifying bottom chord of roof truss to accomodate new AC

We just had a new AC air handler installed, and it's much taller than the old one. Due to an error on my part, it's actually too tall for the space. And it is deeper than the space between the trusses....
1
vote
1answer
193 views

How do I lay joists over a complex-sloped basement floor

I am helping a friend install a bathroom in his basement. The basement floor is partially rock which has been covered in plastic vapour barrier and then covered in a thin layer of concrete. (The ...
1
vote
2answers
10k views

What is the best way to hang a heavy dynamic weight from a flat ceiling with joists?

I want to hang something like http://www.skychairs.com/ or similar in my living room. If the joists were exposed I would mount a beam between two of them and hang over or through that. However, when ...
1
vote
3answers
9k 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
3k views

How should I attach a chin-up bar to floor joists?

I want to mount a chin up bar to engineered I-beam floor joists. Am I safe to mount it directly up into it with lag bolts? If the spacing isn't correct and I span some joists with 2x4s, should I run ...
1
vote
1answer
340 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
1answer
314 views

How can I locate the 2x8 boards beneath subfloor, backer board, mortar, and ceramic tile?

My floor is getting a little creaky in my bathroom. Unfortunately, it has ceramic tile over it (along with mortar and backer board). What I need to do is drill a clearance hole through the grout and ...
1
vote
1answer
31 views

Are outer joists a different distance in “on center” floor framing?

I've watched some videos and talked to a contractor buddy about how to do floor framing. "16 inches on center" is the phrase I keep hearing, and I understand that that will ensure a layout divisible ...
1
vote
2answers
186 views

Can I use a 2x8 for a ceiling joist and rafters on a 16' span?

I'm planning an addition which will be 16' wide by 27 feet long overall. the roof will span the 16' dimension. my question is, if there is no plan to use the space above the ceiling for storage or ...
1
vote
1answer
179 views

How should I repair crumbling joist pockets in a brick wall?

I'm renovating an old row house with wooden joist in masonry pockets. In many places, the mortar under the bearing point of the pockets has crumbled, cracking a few bricks and lowering the pocket. ...
1
vote
1answer
215 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
299 views

How should I run electrical wire perpendicular to exposed joists in my basement?

I have some questions in regards to running electrical in an exposed, unfinished basement environment. I understand that wire running parallel to floor joists should be at least 1.25" above the bottom ...
1
vote
1answer
1k views

How can I add joists to an existing trussed ceiling?

My garage ceiling framing consists of manufactured 2x4 trusses over a 20.5' span and on 24" centers. There is currently some plywood flooring for light storage. The sheetrock that was on the ceiling ...
1
vote
1answer
322 views

Insulating and reducing boominess of plywood subfloor

I have a plywood subfloor in a ground floor extension that is laid directly on the joists. The current floor is half solid wood tongue-and-groove laid on top of green fibre underlay and half fake tile-...
1
vote
2answers
461 views

Is a 6 in. hole in a band joist okay?

I'm installing a Zephyr AK6500 range hood. The kitchen is on the first floor a 2 story home, which was built in 1967. I've run 6 in. round ductwork in a joist bay in the kitchen ceiling to the ...
1
vote
1answer
164 views

Is it allowed to have a small hole bored in a joist in the area where it is bearing on a beam or joist hanger

I am trying to determine if my house is up to code with respect to some holes that I found bored in the ceiling joists. The holes are about 1 inch in diameter and at least 2 inches from the top and ...
1
vote
1answer
1k views

What can I do about joist framing in brick pockets that is uneven and loose?

A 100 year old house with solid cement then brick structure has old floor joists in brick pockets. The joists are 2 by 8 and 2 by 10 inches and spaced about 19 inches apart and not consistently so. ...