Finished Attic Wieght Limit

If you care about this you will need to add a second layer of floor joists over the originals perpendicular is best to limit thermal bridging insulate then lay floor over that.

Finished attic wieght limit.

Finished attics need stairs that meet all of the standard staircase requirements. To simplify you can place 20 pounds of dead load per square foot on your subfloor as long it s supported mid span. This is where dreams of adding new living space in an attic are often abandoned. It is vital to observe the weight rating and make sure that you comply with it at all times.

Dead load weight of roof trusses top chord bottom chord webs weight per lineal foot plf 2x4 2x4 2x4 4 3 2x4 2x8 2x4 5 6 2x6 2x4 2x4 4 8 2x6 2x6 2x4 5 5 2x6 2x6 2x6 6 2 2x6 2x8 2x4 5 9 2x6 2x10 2x4 6 6 2x6 2x10 2x6 7 2 2x8 2x8 2x4 6 6 2x8 2x8 2x6 7 2 2x8 2x10 2x8 8 4 dead load weight of floor trusses depth in inches top chord bottom chord. Stairs can take up a lot of space in both the attic and in the floor below so they are important considerations for planning. Your allowed weight and span for a 2 x8 x12 2btr hem fir based on the info you have provided is 20 psf of dead load and 30 psf of live load with minimum bearing length of 0 68. In general stairs must be at least 3 feet wide and provide at least 6 feet 8 inches of headroom.

This is because the ladder is simply not strong enough to support any more weight and you are putting unreasonable pressure on the attic access ladders every time you break the weight limit. Modern standards call for around 12 to 16 inches of insulation in the attic and your long term utility bills would probably appreciate it. Building codes typically require that a finished space have a ceiling height of 7 feet 6 inches over at least half of the available floor space. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes.