Is to be supported by 5 trusses in the roof of a restaurant.
How much weight on engineered attic truss hold.
Regular garage ceiling joists of modern construction can generally support 50lb sqft.
If you have trusses or your joists are supporting more than just sheetrock or your garage is older this number could be significantly less.
The truss extends from one end to the other approx 50 long.
Of stuff on it.
The ac unit will rest on curbing which runs perpendicular to the trusses and is spaced 4 ft apart.
So how much weight can you hang from your garage ceiling.
That means you could lay a 2 x 4 ft.
If the bottom chord of a roof truss functions as a floor joist such as in an attic room it carries a live load that also varies by use but a typical live floor load for a residential space is about 40 pounds per square foot.
The roof purlins 29 gauge steel and the dead weight of the truss itself usually total about 2 5 psf.
Remember to spread the load across your joists and not along them.
The soffit weight approx.
The truss are 36 in height.
An air conditioning unit weighing 2500 lbs.
Is a safe estimate.
Increasing the total weight on the floor to 4 480 pounds however results in a live load of 40 psf which is beyond the floor s load capacity.
4000 00 pounds with 1 4 drywall.
In my case i have a our bedroom furniture directly above the garage so i would limit my storage just to be safe.
A roof truss is a triangular wood structure that is engineered to hold up much of the weight of the rest of the roof.
A based on the provisions of section 4 7 2 of asce 7 how much should the weight of the ac unit be increased.
The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation.
You will need to add up the weight of your insulation and boards with the 2 5 psf and determine if it is less than the tcdl top chord dead load listed on your engineered truss drawings.
The straight lengths of wood known as members that roof trusses built with are connected with intersections that distribute the weight evenly down the length of each member.
Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70.
If you have a ceiling floor truss combination like you see in this picture you should be able to safely support up to 40 lbs per square foot discounting for any weight you have on the floor above source.
So if your ceiling is unfinished you have some excess carrying capacity up there.
