Knowledge for natural building
How the materials work, how they are installed and what to expect from them.
Airtightness and the Blower Door test: what it is and how to achieve it
What a Blower Door test is: how house airtightness is measured at 50 Pa, what n50 means, when to test, and which membranes and tapes achieve it.
Read →Wood fibre floor underlay: naturheld 220, 22 mm on a screed
naturheld 220 boards, 22 mm, on a screed in a flat in Burgas: a quieter, flatter floor with laminate, floorboards or 19 mm ELKA VITA laid directly on top.
Read →Rendering wood fibre insulation: the Baumit system step by step
How to render a facade with naturheld boards: moisture up to 13%, Baumit StarContact White, StarTex mesh, UniPrimer and finishing render — layers and waiting times.
Read →Roofing underlay: how to choose and install it
How to choose a roofing underlay for pitched roofs: Sd value, weight, pitch, outdoor exposure, metal roofs — and how to install it with tapes and grommets.
Read →The service cavity lining inside: airtight, but not closed to moisture
What the service cavity lining does in a timber wall or roof, why to build it with a naturheld board and lime or clay instead of plasterboard, and why ESB or a DIVA membrane is safer than PE foil.
Read →ESB vs OSB — why ESB is the better choice
ESB vs OSB in figures: about 4 times lower VOC, 2.5–4 times more vapour-permeable, formaldehyde ≤ 0.03 ppm, equal strength in both directions, prices.
Read →Insulation above the rafters: how wood fibre boards stop thermal bridges and water
Wood fibre boards above the rafters: 60 mm of naturheld 140 over FLEX 200 mm cuts roof U from ≈ 0.21 to ≈ 0.15 W/m²K and adds a rain-tight underlay.
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