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The Blow-In-Blanket Insulation System (BIBS) will work well under your hydronic heating tubing, but to get the maximum efficiency from the under floor insulation you will need to install a foil or aluminized paper facing directly under the heating piping. BIBS is an excellent thermal barrier, but the foil will provide a better reflective layer than the fiberglass alone can provide. Several companies make foil-faced paper just for the system you described. Check with a Blow-In-Blanket contractor in your area , or the plumber installing the system.
BIBCA Technical Team