Noticed a lot of joists in my basement are not 90 degrees
#1
11-01-18, 08:24 PM
Noticed a lot of joists in my basement are not 90 degrees
Is it a problem that I find some joists in my basement that are not perfectly 90 degrees? The house is a 1971 small ranch.
Foe example, I'm cutting a lot of foam board to insulate my rim joist and notice that some ends of the foam board I have to cut more of trapazoidal instead of 90 degrees.
I haven't had any problems from the floor above or anything, just wondering,
Foe example, I'm cutting a lot of foam board to insulate my rim joist and notice that some ends of the foam board I have to cut more of trapazoidal instead of 90 degrees.
I haven't had any problems from the floor above or anything, just wondering,
#4
11-02-18, 05:54 AM
After almost 50 years, I doubt there is much stress left in the floor joists to cause warping. However, since the joists are weakest at their midpoint, I would consider adding joist size bracing (vertically) between joists at the midpoint. Cut ends of brace parallel and for a tight fit. Offset every other brace to allow securing by end nailing or screwing. Assuming the joists are properly secured at their ends, bracing won't help there.
#5
11-02-18, 07:47 AM
some joists in my basement that are not perfectly 90 degrees?
Wild guess- was your house built the year of or the year after a flood?
East coast you'll see lots of stick-built houses in 1972-1973 with bowed and twisted beams.
That's due to Hurricane Agnes, because lumberyards are generally close to railroads, and railroad often run parallel to creeks and rivers - so Hurricane Agnes flooded LOTS of lumber yards and lots of people built and re-built with wet wood.
#6
11-02-18, 11:25 AM
Thanks all!
On 2 sides of the house about 6 feet I'd say, from the sides there is some type of X bracing perpendicular to EVERY joist between them right across the basement. One board goes from the top of every joist to the bottom of the adjacent and one goes vise-versa.
There is also a double (I think) 2x10 (I think they're 2x10s) going all the way across the basement in the center perp to the joists.
On 2 sides of the house about 6 feet I'd say, from the sides there is some type of X bracing perpendicular to EVERY joist between them right across the basement. One board goes from the top of every joist to the bottom of the adjacent and one goes vise-versa.
There is also a double (I think) 2x10 (I think they're 2x10s) going all the way across the basement in the center perp to the joists.
#8
11-02-18, 02:57 PM
X bracing perpendicular to EVERY joist between them right across the basement.
What Hal said was interesting and could be the cause.
#9
11-04-18, 11:50 PM
Originally Posted by Norm201
I'd say you fine. Don't worry about.
What Hal said was interesting and could be the cause.
What Hal said was interesting and could be the cause.
