Energy-efficient living in timber: insulation, BENG and your energy bill
Energy efficiency may well be the strongest argument for timber construction — but the world of Rc-values and the Dutch BENG standard is gibberish to most people. Below is the explanation in plain language, with the numbers included.
How good is the insulation?
The Rc-value expresses how well a wall retains heat — the higher, the better. Our homes are insulated to a high standard, well above the requirements of the Dutch Building Decree; you choose the level yourself (Comfort, Premium or Lux). A well-designed ZTC home can reach BENG-plus, zero-on-the-meter or even passive-house level.
What do you notice on the energy bill?
A well-insulated timber home is energy-efficient; exactly how much you save depends on design, installations and use.
Add to that the airtightness — we achieve a measured airtightness down to n50 = 0.24 (passive-house level): no draughts, no cold fall, and highly effective mechanical ventilation with heat recovery (a system that supplies fresh air while reusing the heat from the extracted air). Airtightness is measured at handover with a blower-door test, and you receive the report.
How sustainable is it really?
Measurable on several fronts:
- CO₂: construction timber captures CO₂ as it grows and keeps it locked in the structure.
- MPG score: the Dutch environmental performance score for new buildings comes out considerably lower (= better) for wood than for concrete or steel.
- Circular: at demolition, timber elements are reusable or recyclable.
- Origin: we use wood from sustainably managed Latvian and Scandinavian forests, FSC- or PEFC-certified on request. Latvia is among the most forested countries in Europe.
And the indoor climate?
Residents of timber homes generally experience the indoor climate as pleasantly dry and stable. Wood naturally buffers moisture: absorbing a little during the day, releasing it at night. The result: less muggy in summer, less dry in winter. And wood feels warmer than concrete or brick. Whether you also want to see the wood is up to you — from fully finished with plasterboard to a living room with visible CLT.
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Price indications are based on current ZTC product information; final prices always follow from a project-specific quotation. The foundation falls outside the ZTC delivery.
Further reading
Is a timber house safe? Fire, sound, moisture and lifespan
"Doesn't a wooden house burn faster?" The most frequently asked concern — and the facts behind it, plus sound, moisture, woodworm and lifespan.
Timber frame, CLT or hybrid: what is the difference?
HSB, CLT, hybrid — the abbreviations fly at you. This is the difference in plain language, and how to choose what fits your plan.