1
vote
2answers
191 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
368 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 ...
0
votes
0answers
54 views

Why doesn't a through tenon weaken the stile?

I've been playing with load tables for wood beams in the context of framing a floor. The tables assumes uniform load, which seems valid if the joists are just sitting on the headers. But what if they ...
0
votes
0answers
117 views

Can turnbuckles hold a frame in tension?

I'm building a king-sized bunk bed using a loft/joist design. Basically, I've got (see below): slats nailed into joists joists joined to headers with blind tenons headers joined to posts with blind ...
1
vote
1answer
567 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. ...
5
votes
2answers
6k views

What size ceiling joists and rafters should I use for a 14' span?

I'm going to build a single story addition to my home with a width of 14ft. I plan on using ceiling joists every 16" but I'm not sure which size to get. The roof will be asphalt shingles and the attic ...
10
votes
1answer
641 views

Are there any dangers to sistering a joist with oversize lumber?

I've done some research lately on joist sistering as a solution to bouncy floors. The logic seems to revolve around the following principles. The stress of carrying a load is at the center of the ...