Attic Beam Measurement

Well assuming the attic eats 6db that statement is wrong.

Attic beam measurement.

Fortunately this is a fairly easy fix. Bedrooms and habitable attic floors l 360 30 psf. Step 3 screw an eye hook into the beam where you made the mark. Cut a length of rope equal to this final measurement.

Rafter is a sloping beam usually wood that supports a pitched roof. When cutting your beam pocket add 1 2 to the steel beam width measurement to allow for an easier installation. Attic floors with limited storage l 240 10 psf. Staggered pattern with at least a 3 x 120 nail.

You can sister the joists by cutting 2 x8 boards the same length as the joists applying construction adhesive and affixing each to a joist with nails. A two 2 by 6 standard beam has actual dimensions of 1 5 by 5 5 inches which would give a section modulus of 1 5 x 5 5 x 5 5 6 7 6 which is not enough for this example. Attach a pulley to it by sliding the pulley s hook into the eye. The beam system we show will work for nearly any opening up to 12 ft.

To start each cut a circular saw was used and finished up with a reciprocating saw. Joists and rafters must be strong enough not to break when loaded. You might open up your attic and find bare joists with fiberglass or cellulose insulation between the joists. Use of joists in attic flooring.

We used a bosch green line laser to connect both beam pocket locations and then used a speed square to mark cut lines directly on the joists. Unlike stiffness live loads and dead loads are added together to determine minimum design values for strength. Back up to the pulley on the attic. Strength of a material is obviously important.

Precise measurement is the most difficult as you need to consider all underlying obstructions carefully before proceeding with your plans. Tie a knot in one end to prevent it from accidentally slipping out of the pulley. The 2012 irc code calls for a minimum of a 32 o c. On longer spans the beam may require much more bearing space as indicated by this table.

Covering the ceiling joists in the attic using plywood is a cheap way to make better use of the wasted space in your house. The formula for the section modulus is beam width times beam depth squared divided by 6. The subfloor installation is easy. A pair of rafters is called a couple.

Step 4 run the rope through the pulley. Beams of more than one ply must be fastened together with either nails or bolts. Two 2 by 4 beams together would not be enough. Our 12 ft long beam was made from doubled 11 7 8 in wide x 1 3 4 in thick lvls laminated veneer lumber a very common strong type of beam that looks exactly like thick plywood boards.

A 2 by 8 beam would be sufficient. A 1 4 wave would be 0 dbd at best probably worse but a 6 element beam would be 8 dbd so it looks like the attic beam antenna would win by about 2db assuming same height above ground. Any lumberyard will be able to furnish the beam and other materials.