Carpet Install Questions

Home Depot used to have some stuff for insulating water heaters that is the same as the sound/heat insulation blankets that JC Whitney sells. It's a 1/4" thick padding sort of stuff with a foil facing on one side. Supposed to be mold/mildew resistant. It's sold as a kit to insulate hot water heaters & comes in a 4' by 6' sheet (IIRC) along with some aluminized tape. Last time I looked I think it was around $20 for the kit. I haven't looked for it lately but I imagine they'd still carry it. Whitney gets about $25 for the insulation alone without any tape. The soldering iron trick is good too. Keeps the carpet from unraveling where you put the hole.