How to Build an Insulated Cathedral Ceiling
Nov 18, 2011 · Flat roof cathedral ceiling We're going to give it a try. Existing is a fourteen year old roof with 2" of closed cell roofing foam with an acrylic elastomeric coating. Below is 1x decking and 2x4 rafters. Our plan is to put rigid board up between the 2x4's, caulk the edges, and then hang sheetrock.
Blown vs batt insulation for vaulted, non-cathedral ceiling
Jan 21, 2020 · Blown vs batt insulation for vaulted, non-cathedral ceiling. In my climate (4a), code calls for R-49 in the ceiling. We asked for the roof to be framed so that there’s plenty of room for the insulation. There are two rooms with vaulted ceilings, non-cathedral. The roof pitch is 8/12, but the ceiling joists in these rooms are 6/12.
Cathedral ceiling: R39 vs R50 vs R60 - GreenBuildingAdvisor
Nov 27, 2019 · 30ish% of my roof surface is cathedral at 350 sq ft. R-39 cost per square foot – $9.91. R-50 cost per square foot – $12.12 (cost increase is exactly in line with R value increase) I know code is R-49. I also know that I see R-60 recommended often on this site.
Five Cathedral Ceilings That Work - GreenBuildingAdvisor
Dec 11, 2020 · As long as you pay attention to minimum code requirements for R-values, these cathedral ceiling details can be used in all climate zones. A vented assembly with fiberglass or mineral wool insulation. This is the traditional way to insulate a cathedral ceiling. Note, however, that this approach requires deep rafters or scabbed-on 2x4s to add depth.
What is a cathedral ceiling? - GreenBuildingAdvisor
Oct 18, 2012 · The insulation has to be in that ceiling system that is part of the roof. In an attic, the insulation is typically on the floor, which is the ceiling of the room below. Then the roof of the attic is uninsulated. Moya, A cathedral ceiling is an insulated sloped ceiling. More information here: How to Build an Insulated Cathedral Ceiling.
Three Code-Approved Tricks for Reducing Insulation Thickness
Dec 15, 2017 · The minimum prescriptive requirements for ceiling (roof) R-value haven’t changed recently; the requirements in the 2018 code are the same as those in the 2015 and 2012 code. These requirements are: In Climate Zone 1, a minimum of R-30; In Climate Zones 2 and 3, a minimum of R-38; In Climate Zones 4 through 8, a minimum of R-49.
Minisplit placement/zoning relative to loft with vaulted ceiling?
Feb 10, 2020 · The basic layout is a 20×41 gable rectangle, with an 13×41 shed roof portion attached (all in 1 envelope) all oriented east west long axis. The gable portion is 1.5 stories, with a partially enclosed loft. The kitchen is under the loft, living room is open to a vaulted ceiling, 23′ at apex. The loft has a portion open to below, and an ...
Venting vents in a vaulted ceiling - GreenBuildingAdvisor
Aug 29, 2024 · 1. Cut the 48″ length into two 24″ sections, or three 16″ sections, and install these with 1-1.5″ spacing between adjacent baffles (this would be my preference) 2. Have the original 48″ baffles butted against each other, but drill a grid of 0.5-1″ dia holes in, say, a 2×8 type grid to make this more permeable (this is doable, but ...
Insulated cathedral ceiling/roof layers - GreenBuildingAdvisor
Jan 8, 2020 · Insulated cathedral ceiling/roof layers. I am wanting to figure out the best build-up for an insulated cathedral ceiling/roof. Here are some of the basics: 1. Zone 6B – so should be R49 or higher. 2. Roof pitch 5:12. 3. The roof structure will be BCI rafters over the top of a ridge beam and two purlins (one on each side).
2021 IECC Insulation Requirements - GreenBuildingAdvisor
May 29, 2021 · Community and Q&A. 2021 IECC Insulation Requirements. The 2021 IECC increases ceiling insulation requirements for Zones 2 and 3 from R-38 to R-49. Based on the math below, this increase seems to make a meager difference in performance, even at a large Delta T. I can’t imagine it would save much energy.