Open Web Joists Vs. Wood i-beams
DallasAuburn
13 years ago
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bigkahuna
13 years agomacv
13 years agoRelated Discussions
wood i-beams for roof?
Comments (8)I Joists are just fine. I used them in my vaulted space due to the span vs solid lumber. Plus I wanted them 14" deep for insulation reasons. Now typically you will need a ridge beam vs a trussed roof. There are bearing details that need to be followed that include limits on how the foot can be cut, and if web stiffiners need to be installed. I assume since they are suggesting it, he is familiar with the installation requirements. However depending on the span, I can not see how they would be cheaper than solid lumber, assuming that is the alternative. (they are straighter, lighter, and stronger than solid wood which could be their reasoning as well)...See MoreClosed vs Open cell Foam/ roof rafters vs attic floor
Comments (10)this is the trade off Richard. Time, materials and effort to air seal vs cost to foam insulate& air seal in one step. one takes considerable effort and time although materials are less the other takes little time little effort and higher cost. air sealing is the KEY to insulation performing as spec'ed. foam just makes it easier. And haven't you noticed that FAQ's are ok for the other guy..but this is MY house ans I have specific to me questions...LOL! Just the way it is... OP, in my cooling climate we insulate to R-38 there is a diminished return on investment with more insulation..but it starts diminishing when you insulate over R-19 as the first few inches of insulation work the best.However most states mandate R-30 and above and there is a good savings in higer values. Just how much for above R-38?? Don't know for heating climates..ask Joe @ bulding science! I'm glad to hear that you would remove the batts before foam sealing the attic floor. Personally this is the location I would purchase in your situation. No mechanicals or ducts in the attic make the roofline install more of a profit for the foam co than actual benefit to you. If I were you I would opt for this, but with the specification that the insulation at the eaves of the house be installed from attic floor to soffits to roof making this an air tight install. (it won't be 100% air tight...even though they sell it as such) This will seal exterior walls at top plates which is always an air infiltration site. Oh and WELCOME YOU! Merry Christmas all!...See MoreSteel Beams to Support Joists?
Comments (9)Warranties are only good if the contractor is still in business. Structural problems will not show immediately they will start to show as cracks, unlevel surfaces, etc. Also as a structural element there could be a structural collapse. The $500 is cheap relative to the cost of a redo. Have the engineer come out, document and sign/seal as suggested earlier. I would also suggest you get local inspectors looking at the work. Where I live if you don't get permits and it�s noticed you will be asked to pull the permits with the inspector having the right to do a tear down to inspect....See MoreTo Expose Joists, Or Not To Expose Joists?
Comments (5)edit to add--Plus more places for dust to accumulate and spiders to swing their webs where you have to knock them down. Also adding a lot more cubic feet of space that has to be heated and cooled. Your current HVAC may well not be up to the task....See Moresrercrcr
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