can this type of floor joints support 180G??
- Thread starter jp80911
- Start date
jp80911;1602158; said:
Check craigslist.com in your area. May be some good deals really depends. Good luck though!
Not all floor joists are created equal. The top plate of the joist is a 2x4 laying flat, which is not it's strong dimension. The top plate is also in compression rather than tension, so it is not ideal for supporting a heavy load across a portion of the unsupported member (from the outer wall to the top of the triangle formed by the interior members).
There is no question that the joists will support the weight. The problem is that you risk permanent warpage of the top plate of the joist. The solution is simple though. Screw a sheet of at least 3/8" plywood to the side of each of the joists. It will need to cover the top and bottom plates and at the very least, run from the outer wall to the center of the triangle formed by the inner members. Put a screw every three inches.
The tank and stand will weigh approx. 2735 lb. The weight will be spread over 4 joists for a total of 684 lb per joist (assuming standard tank dimmensions). Have three big guys stand on a 2x4 the length of half of your span. The 2x4 should lay on its side to duplicate your floor. That deflection is what your four joists will experience over the life of the tank. Moisture and humidity in your basement will compound the problem.
Adding a double support beam and floor jacks under the interior edge of the tank is also a good solution if the basement space will not be important.
Never mind...I just noticed the cinder blocks at the bottom of the picture. Using them as a scale, I see that the unsupported span is only aprox. three feet. Measure that distance, and if it is correct then you are good to go.
One more correction, upon further review with the placement of the loading (I placed it incorrectly originally), the top plate of the joist is in tension with the center and outer members being in compression. Not that it is important at this point, but it is just splitting hairs.
CHOMPERS;1609540; said:
Not all floor joists are created equal. The top plate of the joist is a 2x4 laying flat, which is not it's strong dimension. The top plate is also in compression rather than tension, so it is not ideal for supporting a heavy load across a portion of the unsupported member (from the outer wall to the top of the triangle formed by the interior members).
There is no question that the joists will support the weight. The problem is that you risk permanent warpage of the top plate of the joist. The solution is simple though. Screw a sheet of at least 3/8" plywood to the side of each of the joists. It will need to cover the top and bottom plates and at the very least, run from the outer wall to the center of the triangle formed by the inner members. Put a screw every three inches.
The tank and stand will weigh approx. 2735 lb. The weight will be spread over 4 joists for a total of 684 lb per joist (assuming standard tank dimmensions). Have three big guys stand on a 2x4 the length of half of your span. The 2x4 should lay on its side to duplicate your floor. That deflection is what your four joists will experience over the life of the tank. Moisture and humidity in your basement will compound the problem.
Adding a double support beam and floor jacks under the interior edge of the tank is also a good solution if the basement space will not be important.
Because they are 2x4s on the flat there will be a lot of flex and depending on the quality of the wood something could snap. Just because it is engineered doesnt mean anything just that it is a cheaper alternative that mathamaticly can handle the weight...
Personally I would beef up the floor with 2x12s between the engineered floor joists where the tank with sit. but I just like to over build things, just so there is no fear...
CHOMPERS;1609540; said:
Not all floor joists are created equal. The top plate of the joist is a 2x4 laying flat, which is not it's strong dimension. The top plate is also in compression rather than tension, so it is not ideal for supporting a heavy load across a portion of the unsupported member (from the outer wall to the top of the triangle formed by the interior members).
There is no question that the joists will support the weight. The problem is that you risk permanent warpage of the top plate of the joist. The solution is simple though. Screw a sheet of at least 3/8" plywood to the side of each of the joists. It will need to cover the top and bottom plates and at the very least, run from the outer wall to the center of the triangle formed by the inner members. Put a screw every three inches.
The tank and stand will weigh approx. 2735 lb. The weight will be spread over 4 joists for a total of 684 lb per joist (assuming standard tank dimmensions). Have three big guys stand on a 2x4 the length of half of your span. The 2x4 should lay on its side to duplicate your floor. That deflection is what your four joists will experience over the life of the tank. Moisture and humidity in your basement will compound the problem.
Adding a double support beam and floor jacks under the interior edge of the tank is also a good solution if the basement space will not be important.
The distance from the outer wall to the center of the triangle is about 32". By screwing 3/8" plywood to the side of each joist you mean something like the attached picture? Those are the joists at the center of the floor.
I can also try to run a cross beam at the end of the triangle and support that with some lally columns or jack posts; Home Depot sells one for like $32 each.
