Funny how this was years ahead of subsequent vids on other channels. Says a lot.
hsiehkanusea
I bookmarked this to add to relevant vids for the 2.5 story extension with thick walls. Thank you ever so much☺ 👍💯 🙏💝🇨🇦
MegsCarpentry-lovedogs
Looks like a great way to Upgrade the Roof insulation wish I had seen this Video before installing a new roof 2 years ago Now I have to do it the hard way from the attic. Thanks for making this video.
ralphc
I have a 1944 cape cod in Seattle with 2x4 walls and 8:12 rafters. The attic is Finished & Conditioned living space with knee walls and some blown in insulation (~12" on the knee wall floors and "maybe" 3.5 blown in between the rafters sealed in with rigid blocking). Seattle code suggests R38 for roofs. I need a new roof this summer, and want to add insulation on TOP of the deck.
Does this process seem reasonable for an experienced DIY with retired pro roofer help?
1) tear off shingles & paper, remove gutters & uppermost siding.
2) Add peel and stick membrane to the sheathing. Add tape down to the exterior wall membrane.
3) Add 2 layers of offset rigid foam, tape upped layer
4) Lay 2x4s on the flat every 16" above rafters, for ventilation and eves. Secure with long Headloc (or Deck Screws?).
5) Lay new sheathing, membrane, and shingles (or metal).
6) Build out eves/soffits with ladder framing attached to house, add bug barrier, fascia, ventilate at each rafter bay, re-attach siding and gutters.
What would the ideal rigid layers look like? Unfaced 4" below and faced 2" above would be R33. There's plenty in the rafters joists and knee walls to get to R38.
dr.timothyr.morris
Reminds me of my idea for what I called a double decker roof assembly. The idea was for zip sheathing over roof framing taped and wrapped then the 2x4’s on their flats for the air gap then another layer of radiant barrier roof decking. Goal was to minimize radiant heat flow to almost zero.
keoki
Excellent. I learned more from this little 2 minute video, than hours of culling through others. I’m just going to substitute rockwool over foam. You were brief, to the point. I enjoyed your wall vented video as well. Only thing that I would have liked for you to cover, is how to handle the peak at roof. Since heat rises, seems like at peak, it would be released there. Did it just stay completely closed up? TY for this wonderful little video.
johnlile
Adding insulation is definitely good. Adding weight may not be possible or safe for all roofs.
Jookyforever
This video animation is EXACTLY what i was looking for!
Thank you!
Question?
I live at 6, 000 ft in Northern Az and get snow... What would be the minimal thickness of rigid foam youd recommend?
I can't find calculations anywhere?
Arizonamountainman
Can you please comment on the design of the top ridge of the house? Just a regular ridge vent? Any details on a vapor open or closed membrane? Interior insulation recommended as well, what type?
TheChupacabra
i'm refacing my house and adding 5" of exterior foam prior to the new gfrc cladding. Roof needs some R value bad and tons of leaks as its currently 1x6 strips and shingle. I'm worries cops stopping by my house thinking its a grow up because snow never accumulates like the neighbors! do you think the first later of weather barrior is really needed since the xps foam is closed cell?
Much thanks. Great vid, stood the test of time!
houmanghasemian
That seems like a lot of extra weight. Are you sure those 2x6 old house rafters are ok with that? Not to mention the walls supporting the roof?
nofurtherwest
Now That's A Quality Roof.. Good Video, And Damn Good Work.. Jus Sayin.. Yep...
commonman
Adds a lot of weight to the structure. Be sure the roof can take it.
newstart
(Opps - first time I have commented on a video.) Now to my question - I need someone to do this kind of work on Cape Ann in Massachusetts. Are there roofers or construction companies in my area that have done a lot of this. The roofers I am speaking to seem pretty unfamiliar with the process. I have a 1935 open rafters home and am trying to put as much insulation on the outside as possible without making the house ugly. Thoughts? Recommendations?
michelejurgens
what is your spacing on the screws and what about gable overhangs
gyo
How are you going to handle the moisture migrating into the attic from the home since it's no longer ventilated?
JohnComeOnMan
You didn't put a drip edge on the new roof, why?
MountainRiverRunner
Anyone know the name of the mesh/bug screen block? I googled around and only found regular bug nets, not blocks like in the video.
dapper-alien
My research suggests this technique should perhaps be coupled with a “vapor diffusion port“ at the ridge. Thoughts?
