Tutor's Assistant: OK. Is there anything else the Structural Engineer should be aware of? The house is located in Chicago. As far as ice dams go, we do get pretty good ones. The point about the wood memory is well taken. There’s just not enough space. built on 4/12 pitch roof with 1/2 ply decking and shingles. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Install siding over the insulation. What size and what span? Itâs all old 1921 âSheetrockâ covered with newer stuff in most places. I was hoping to 'replace' the damaged rafters with a new full length, but it doesn't appear to be possible. vertical end beam and rafters checked for level. thoughts, ideas, suggestions from past experience? A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. JavaScript is disabled. Caulk window trim and use weatherstripping to reduce air leaks. Attach 1-inch foam board insulation. Yes I believe it is balloon framing. i put 2 2x4 joist about. Codes specify length, girth, and number of nails in critical joints. I have an older house with 2x4 roof rafters which an architect has surmised was okay considering the spans involved. If it helps at all, I can push up on the sister at the ridge, screw, and shim the inch gap between the new rafter and ridge board. Those ceiling joists at the bottom of the picture look new. The floor itself is just old boards/planks. if it has sagged if you screw below the crack first you may be able to push it back up and screw the top. The insulation under there was worthless. There’s a few inch gap between the new rafter and the deck at the ridge. Do not use flat bottom gables with scissor trusses. I had the bottom angle of the rafter off just enough to make it not fit. Wow, looks like a tree landed on the roof. There are some unfinished crawl space areas in the corners on the upper floor. In my area, R-38 is recommended (20722). The originals obviously went in before the roof decking. So at 16"OC, each joist is 2-2x4s together. House Framing Tips Nails. I’m currently assessing how many I need to repair. Two-by-Six construction is the main alternative. I use a roof rake to minimize this but itâs hard to keep up sometimes. JavaScript is disabled. The rafters are 2x4 (possible actual 2x4, species unknown, likely old-growth D.Fir or similar) at 16" o.c. It's completely gutted right now. For a better experience, please enable JavaScript in your browser before proceeding. Unfortunately, history has shown us that old structures made from 2x4’s are just as strong as homes built today with 2x6’s. I’m currently assessing how many I need to repair. It currently has very old insulation in the attic floor. It has a hip roof, 900sqft unfinished walk-up attic. I have a 1929 craftsman house with dimensional 2x4 rafters on 24" centers. Fabrik8 Overcomplicator. Two-by-Four construction is by far the most common, and is based on the ubiquitous 2x4. For roofs that won’t experience heavy snow loads, a gable roof can span up to 22’ with 2×4 rafters. 3) Only part of the roof framing may be trusses and the rest is rafters, as in the photo below. If you can find some Southern Yellow Pine 2 x 4 s use those. Headers & Beams. Our framing cost calculator has a preset wastage value of 15 %, which is the most typical amount. Roof decking is 1x5 tongue and groove over the old part of the house and 1x7 over the "newer" extension. My problem is I can’t swing in a full length 2x6 up to next to the existing rafter. Meeting this in 3 1/2" will not cut it. I have a small cape style house built in the 1920's. If you are doing collar ties I would fit them to the bottom but either way I don't see a big weakness. Repeat the process on the other side of the old rafter so that the old is sandwiched between two new pieces. Install the second rafter leg in the same manner. From what I imagine larger rafters would need to be in place of those 2x4 top chords. I THINK there are two layers of asphalt shingles. A rafter or speed square will have marks for both of these angles. There’s a couple with cracks. Reply. skinned with 7/16 osb and vinyl siding. Will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed, Re: will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed? I'm an amateur, but I thought that knee walls put additional load on the joists. There’s a couple with cracks. And if it's shade you want from the rafters, they should run north and south. They are directly below the roof sheathing and are'/were insulated with fiberglass batts stapled between the 2x4 rafters. I would go with as long as you can handle. 1/3 of the way from each in to keep it from spreading from snow load. I have 2x4 rafters in my 100 year old house. There is no insulation between the floor joists of the attic or the roof rafters. I was able to squeeze a 2x4 in there with the influence of 10# sledge. This is possible because the load transfer (like for your knee wall) would be so close to the outer house wall that it wont deflect your floor joists. Roof & Wall Metal Purlins. The problem is getting in next to the rafter. Before you cut your boards, you’ll need to measure the width of your building and calculate the exact length of each rafter. It’s looking like I can sister with 2x4s about an inch shorter than the rafter. The 2x4's are 1-11/16 X 3-5/8. I have 250 feet of 12/2 mc cable that I was going to use to do the electrical that I got from a friend for free. Replace old windows with energy-efficient units. This type of construction has two main types: 2x4 and 2x6.