So if your ceiling is unfinished you have some excess carrying capacity up there.
How much weight on engineered attic truss hold.
An air conditioning unit weighing 2500 lbs.
The soffit weight approx.
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.
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.
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 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.
Remember to spread the load across your joists and not along them.
The roof purlins 29 gauge steel and the dead weight of the truss itself usually total about 2 5 psf.
In my case i have a our bedroom furniture directly above the garage so i would limit my storage just to be safe.
A based on the provisions of section 4 7 2 of asce 7 how much should the weight of the ac unit be increased.
So how much weight can you hang from your garage ceiling.
Of stuff on it.
Regular garage ceiling joists of modern construction can generally support 50lb sqft.
The truss extends from one end to the other approx 50 long.
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 are 36 in height.
With an evenly distributed live load of 30 psf which the tables show the floor is able to support the total weight on the floor would be about 3 360 pounds.
The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation.
The ac unit will rest on curbing which runs perpendicular to the trusses and is spaced 4 ft apart.
Scrap of plywood over the chords and set about 40 lbs.
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.
That means you could lay a 2 x 4 ft.
4000 00 pounds with 1 4 drywall.
A roof truss is a triangular wood structure that is engineered to hold up much of the weight of the rest of the roof.
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.
