How To Add 2 X 4 To Attic Rafters

Attics are fresh air ventilated so provisions must be made to reroute the attic s ventilation through the rafter spaces and the rafters must then be insulated.

How to add 2 x 4 to attic rafters.

Anyhow they currently have batts of fiberglass between them which is in co. Roof insulation for 1 1 2 story homes a home where you have living space in the attic is typically installed in the rafter spaces. Upper bedrooms are made up of about a 24 inch high exterior wall then vaulted ceiling. Attach 1 2 inch wood cleats to both sides of the existing rafter.

Next set the framing square on top of the rafter beam and use a pencil to trace the outside edge of the framing square s tongue. Adding a 2 x 4 along the bottom chord of the 2 x 6 ceiling floor joist maybe helpful in stiffening the joist as well. How to increase the interior ceiling joist for r38 insulation. I thought the rafters were 2x6 s but they are 2x4 s.

I need to add a 2 6 edge edge to my current 2 6 rafters to accommodate r 38 or better insulation in my attic ceiling that will be finished with sheetrock after insulation. There are a myriad of ways to do this from what i see and my question is around a good fastening methods. 1 1 2 story house built in 1904 i think. When installing 2 by 4 lumber to existing 2 by 6 rafters add the 2 by 4 width which is 3 1 2 inches to the 2 by 6 width which is 5 1 2 inches for a total of 9 inches.

Use cleats the same length as the width of the new rafter when added to the width of the old rafter. 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. So if your rafters are only 5 1 2 deep that is all the space you have for insulation. Gluing and screwing a 3 4 attic subfloor and providing solid bridging should also be considered.

Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on. Once you ve marked the lines use your pencil to draw the diagonal length on the. To cut roof rafters start by fixing the stair gauges on your framing square to the dimensions of your pitch.