can this type of floor joints support 180G??

[CHOMPERS]

By screwing 3/8" plywood to the side of each joist you mean something like the attached picture?

Exactly!!! A picture is worth a thousand words

Since the distance is only 32", the joists are suitable without modification. Adding the plywood reinforcement will be an easy and inexpensive modification and won't clutter the basement floor. If it gives you piece of mind, then go for it.

 

[jp80911]

Exactly!!! A picture is worth a thousand words

Since the distance is only 32", the joists are suitable without modification. Adding the plywood reinforcement will be an easy and inexpensive modification and won't clutter the basement floor. If it gives you piece of mind, then go for it.

Looks like I just got my next project planned..time to buy some power tools other wise it would be painful to screw 100 screws..
are screws better or nails will do?

 

[HeavyChicken]

No modification is necessary, Most floor Trusses of that design are capable of holding 750+ LBS in the center of a 10 foot span, so imagine what the load bearing capability is right over a support or at least very near a support.

 

[ttmf]

oops replied in the wrong thread

 

[cichlid fiend]

Believe it or not those trusses are stronger then they look. Im a electrican and I have wired plenty of new homes. When I first started I would ask all the time can these pre fabed trusses really be stronger then the old way they used to build homes. Every carpenter would say the same thing-Looks can be deceiving. I wouldnt worry about it get ur tank and call me over so I can see it in person!!!!!

 

[fwiffo]

if it was me, i would add supports from the floor joists to the basement floor just to be cautious. when the supports are in place, you could even add some nice wood to the sides of it, kinda setting it apart from the rest of the basement for storage of odds and ends.

 

[dawnmarie]

Adding the plywood would be cheap insurance.Drywall screws and Gorilla glue would yield super tough box beams.
Unnless you are going to put the tank in the middle of the room I wouldn't worry about it. Those trusses are a lot stronger than one might think.

 

[scottydosnntkno]

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.

no matter where the loading is, unless it is on a point in the center of the top chord, the top member is in compression. and even then, that particular span may be in tension, but the entire top chord is in compression from the weight attempting to sag the joist.

its just the physics of how trusses work. Top chord in compression, bottom in tension, no matter where the load is.