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I'm using 1/2 of a double garage in DALLAS TX (100 deg today). Garage has dry wall, but I added insulation board on west wall & insulated metal garage door. I'm using a portable dehumidifier usually set @ 35%, & a portable A/C (12,000 BTU) running about 20 hours.day. This is holding temp to slightly less than ambient (- 3 or 4 deg). The purpose is for rail expansion, not comfort. I cut gaps for 110 F ( assuming 9.1/1,000,000 linear expansion for rail is correct, ie 9.1 X LENGTH in inches X DELTA TEMP). If not, I'll have to cut more gaps. I'm nailing flextrack to homosite road bed on 5/8 inch plywood with L-girder frame. I wish I would have gotten better plywood, so I painted Plywood & frame. So far so good on warpage & expansion, since last September.
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