GBA community, looking for input. I currently have an uninsulated slab on grade with vinyl asbestos tile on top. I'd like to go directly over the top with 1/4" cork…
Hi Martin/GBA Community, I'm thinking about installing rigid foam on the exterior with "innie" windows. Would like some thoughts on this set-up, from interior to exterior Drywall -> 2x4 wall…
Brad, I purchased the HydroGap early on, and wasn't intending to use foam. Would like to use HomeSlicker plus Typar but trying to balance cost and ideal assembly. HydroGap seemed like a reasonable balance between the two.
Posted: 02:22 pm on November 10th 2017
Tyler, I'm toggling between reusing the 1x10 cedar beveled siding (I'd need to purchase some new as some old boards have cracked) or using a Hardie lap siding (or similar). Looks like Hardie says their siding can be installed directly against foam, but I'm thinking it would be better to have some type of drainage plain.
Posted: 02:24 pm on November 10th 2017
I'm wondering if there is any drawback to using a WRB behind the foam AND in front of the foam. So the foam would be sandiwched between Tyvek and HydroGap.
Posted: 02:25 pm on November 10th 2017
Thanks Dana, I'll take a look at alternate foams. I was thinking XPS but was unaware of the HFC agents. I'll find something more eco-friendly.
Posted: 11:58 am on November 13th 2017
Matt: How did you source the reclaimed polyiso? I'm in Shoreline, WA and am in the process of adding exterior rigid foam.
Posted: 05:57 pm on November 15th 2017
As far as I can tell, encapsulating the asbestos is permissible in Washington. I’m going to dig a little deeper and confirm prior to covering. Marine Zone 4. Slab is 4’ to 8’ below grade and stays a pretty consistent 50-55 degrees year round. Constrained by a couple of factors, main one is the floor comes to the bottom of a set of stairs and if I raise it 1”+, I will need to rework the entire set and second floor to stay within code limits. So trying to keep the buildup at a minimum on the floor.
Posted: 02:18 am on February 4th 2018
Thanks, Martin. I am constrained by ceiling height. I will research the instructions and get a better idea of energy efficiency before I proceed. Thanks again.
Posted: 03:24 pm on February 6th 2018