Does anyone care to take a guess on the maximun span for 2"x6"T&G over 4X8 timbers?
48''? That's what we did. I wouldn't go more...
Quote from: Redoverfarm on January 30, 2008, 10:48:35 PM
Does anyone care to take a guess on the maximun span for 2"x6"T&G over 4X8 timbers?
No :) Max span is not my thing ;)
Bad idea IMO.
I used 4 x 12 (true dimensions) timbers in my cabin and they were at 48" on center. We used 2 x 8 T&G that was actually about 1 3/4" thick. Seems very solid to me!
It depends on how far your 4x8 beams are spanning as well. Mine was spanning 18 feet. (Plus I used a 4 x 12, you are using a 4 x 8 )
Good luck!
Depends bow much weight you want it to hold and how many supports the boards are going to span. Best results will be if the boards span atleast 3 supports. For a floor I'd say 4' is a safe bet.
Oehler's engineer rated it around 250# psf for holding 2 feet of dirt and a foot of water on the roof of the underground cabin at 3'10" span or about 4' centers. Should hold people fine on 4' spacing IMO.
On the "I rekon it'll hold" charts, you'll be fine. I'd cut it in half on the "Damn Sturdy" chart! ???
If you are loading a 2x T&G deck for a loft load you can get close to 6' o/c according to old span charts from the 70's. I don't go much over 4' with materials you can get today.
If you are using this for a roof deck then it depends on the dead and live loads of the roof. A loft (for comparison) has a 30 lbs PSF live load and 10 lbs dead load. Main living floors are 40 lbs on the live load.
Thanks John. This will be a loft floor. One direction 51" the other is 46". Just trying to figure out which is the most benefical option to go around a fireplace in the middle of a room on three sides. The main loft rooms (excluding the fireplace surround) are only 36" span. These are 90 degree rooms off each other(16'X14' & 16'X18') so at one point I will have to change directions of the flooring run at the fireplace surround.
One house I did many years ago had 2x6 T&G hemlock decking on the 2nd floor. We needed it to span something like 5-1/2' if I remember right. It was a full upstairs with 2 bedrooms. With just the decking installed there was a bit too much of a bounce. We put down 5/8" plywood as carpet underlayment and everything firmed up nicely and there were no complaints.
That's maybe more than I would go today. ;) (Do we all get more conservative as we age?)
Quote from: John Raabe on February 02, 2008, 10:51:19 PM
#1: many years ago
#2: (Do we all get more conservative as we age?)
#1: I'd say that's the key thing , the lumber we have to use today is no where as good for the same size / or /and grade ! Older pre 1990 2x6 T&G , and other stock was better lumber.
I've watched it go down hill over the years.
#2: As far as "conservative" maybe it's just smarter ;)