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Hangblague
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# Posted: 12 Feb 2020 02:38am
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I'm inexperienced. I saw some ideas in this forum, but I couldn't find any comments on what I was thinking: furring strips between joists (high up) with rigid boards just sitting on top of strips flush with top of joists. Bad idea?
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benny8
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# Posted: 12 Feb 2020 04:26am
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Mice and ants love the rigid insulation. I used the Reflectix bubble foil over top of my joists and then installed the plywood deck over it. Three years and no rodents or ants. Just my opinion, but I know others who have had good success with it as well.
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Brettny
Member
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# Posted: 12 Feb 2020 07:30am
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Bubble foil really isn't insulation. It may allow for an air gap and air sealing though. Some times that s enough. Air sealing does make quite a benefit.
Really prob no matter what you do to make it rodent and insect "free. You should be covering the whole bottom with plywood and spray foaming any gaps.
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sparky30_06
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# Posted: 12 Feb 2020 08:04am
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Quoting: Brettny Really prob no matter what you do to make it rodent and insect "free. You should be covering the whole bottom with plywood and spray foaming any gaps.
this creates another issue of moisture being trapped
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toyota_mdt_tech
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# Posted: 12 Feb 2020 08:21am
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Yes, with sparky, needs to breathe. I liked the idea of a nice galvanized mesh with 1/8 or 1/4" holes, crown stapled to underside of floor and rim joist.
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Brettny
Member
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# Posted: 12 Feb 2020 09:48am
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Even 1/8in wire mesh will allow bees to get in.
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Aklogcabin
Member
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# Posted: 12 Feb 2020 11:20am
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Would it be better to leave an inch gap or so between the plywood sheeting and the rigid ?
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rpe
Member
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# Posted: 12 Feb 2020 08:47pm - Edited by: rpe
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We insulated our floor with R30 Rockwool, stapled over with Tyvek to hold it all snug. Then we followed up with 1/4" mesh galvanized wire cloth to keep the critters out. We are on the second winter, and so far we are critter-free.
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LittleDummerBoy
Member
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# Posted: 12 Feb 2020 11:02pm
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I used a sandwich of 1/2" CDX, 1" foil-faced rigid foam, 1/2" CDX in my cabin floor in northern NH.
It has worked perfectly for 20 years.
None of my mice either chew it or nest in it. I have a regular population of mice.
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Brettny
Member
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# Posted: 14 Feb 2020 07:59am
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That's a good idea. Two sheets of plywood with foam inbetween.
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