Quick Answer: How Much Weight Can Attic Joists Support?

How much weight can a 2×4 ceiling joist hold?

2×4 are suitable for ceiling joists where the LL is like 20 Lbs.

If you got a good species with the highest Modulus of Elasticity and Best grade and use like 12″ o.c.

– you might get 8” span..

Can attic joists support a floor?

If the joists are larger, they might support attic flooring, but the only reliable way to know for sure is to have a structural engineer take a look at your attic support system. In some cases, even larger joists will not support a new living area, so it’s vital that an engineer take a look.

How can I make my attic floor stronger?

If the attic joists are not adequate, one way to strengthen the floor for live loads is to sister the old joists. Sistering is the process of adding a new joist next to each existing joist. In the case of 2×6 joists, you can pair them up with additional 2×6 joists by nailing them together, side by side.

What should not be stored in an attic?

7 Things You Should Never Store in Your Basement or AtticDelicate fabrics. … Furniture and décor made from natural materials. … Important papers. … RELATED: The Safe Way to Store Important Papers »Food (unless you store it carefully) … Electronics. … Candles. … Anything flammable (near heat sources)More items…•

Can I put plywood over attic insulation?

An attic can be floored with 1/2″ CDX plywood, if it is being used only for storage. However, the same can’t be said if you are planning on using the space as a living space. In that case, you will need to use 3/4″ thick plywood. … The building code allows for the use of OSB in place of plywood for subflooring.

Can you lay loft boards directly onto joists?

The supports just need to be attached to ceiling joists or roof trusses, spaced around 1m apart, and then the loft boards can be installed directly onto the supports.

Can attic floor support weight?

Floor Framing The floor structure of an attic is also the framing for the ceiling beneath it. This is made up of ceiling joists, typically 2×6 or larger boards. … The joists should support your weight, but the space between them almost certainly will not.

Can you overload an attic?

Some attics do not have a full floor, and heavy objects could eventually fall through drywall, compromising your ceilings, and endangering the household members who are living under the attic space. Even when flooring is present, avoid overloading any areas to ensure safe storage.

How much weight can a ceiling joist support?

50lb/sqftRegular 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. Remember to spread the load ACROSS your joists and not along them.

How do I install a subfloor in my attic?

Position the plywood sheet so that the longest side of the sheet lies perpendicular to the joists and the ends of the plywood lie directly on the chalk lines. If the plywood overhangs the chalk line and joist, measure and cut the plywood accordingly. Leave a 1/4-inch gap between the attic wall and the plywood edge.

How can I make my attic space usable?

If this is your first remodel, consider hiring a professional to help you convert your attic.Clean Out Your Attic. … Wire the Attic for Electricity. … Build a Subfloor. … Insulate Your Attic. … Install Drywall and Ceiling. … Paint Attic Ceiling and Walls. … Choose and Install Attic Flooring.

How much weight can an attic support?

Most trusses are designed for only 10 lbs psf live load for storage, unless they are attic trusses like Drooplug mentioned. You’ve added about 300 lbs already when you put 6 sheets of plywood up there. As Larry said, don’t overdo it.

How much does it cost to put flooring in attic?

The cost of attic flooring ranges from $3,000 to $16,000, depending on what you already have. The existing floor joists may not support weight, so you’ll probably need most of these services: Price to replace floor joists: $1,000-$10,000. Cost to install subfloor: $500-$800.

What size should attic floor joists be?

Typically, ceiling joists are 2×6 or 2×8. They are designed to carry only the weight of the drywall (or plaster depending on the age of your home). Once we look to make the attic livable space, the existing ceiling joists usually will not meet the structural requirement for a floor.

Can you use 2×6 for floor joists?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. …

How much weight will a 2×4 hold on its side?

3 Answers. The Sagulator says it will support about 375 pounds (evenly distributed) before there is noticeable deflection. I recommend you go to the site, read the notes, and play around with the numbers yourself.

How much weight can a 2 by 4 support?

Assuming that the load is square and there is no wind, the average 8 feet 2×4 could handle around 1,000 pounds vertically. Of course, it’s wise not to push the material up to its limit, use brace and alike to secure the 2x4s whenever it’s needed.

How long does it take to convert an attic?

about 10 daysA basic attic conversion will take about 10 days to complete, Gilbert says, but to make the attic space look and feel habitable, you need to factor in good sources of natural light and ventilation.