Insulation in Redmond

Education Hill and Overlake homes built in the late 1970s through early 90s — most of them in zip 98052 — got R-19 fiberglass batts in the attic at construction. That satisfied code then. Seattle's current energy code targets R-49, and the difference shows up on every PSE bill from October through March. A Mitsubishi heat pump running against a half-empty attic floor never reaches its rated efficiency. The system cycles harder, runtime climbs, and the indoor temperature still swings. TopVolk Construction LLC has handled this upgrade on 100+ Seattle Metro projects since 2017 — WA Licensed Contractor, owner-led, no sales staff between you and the person doing the work.

Zip 98053 — Redmond Ridge, Bear Creek, Novelty Hill — is mostly 2000s-era construction. Many of those homes have decent attic insulation but skipped crawlspace encapsulation entirely. Zip 98052 runs older. Education Hill and Southeast Redmond ranchers and split-levels from the 1970s and 80s have original fiberglass batts that have compressed over four decades and now perform well below their labeled R-value. A batt that started at R-19 in 1983 is often measuring closer to R-10 in the field today — not because the material failed catastrophically, but because it lost loft, shifted, and left gaps around ceiling penetrations. Redmond crawlspaces stay damp from October through May. That sustained moisture degrades batt performance and creates conditions for subfloor mold if the vapor barrier is missing or undersized — a common situation in homes that were never re-inspected after original construction.