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Energy performance

Energy-efficient timber houses start with the right structure

ZTC adapts timber structures to project energy requirements, insulation, airtightness and assembly quality.

ZTC experience and production facts

34+

years of experience

400+

completed projects

14

European countries

±1 mm

CNC precision

Technical energy performance indicators

ZTC timber structures can be designed for strong thermal performance, but the final result depends on the whole building — not wall thickness alone.

Wall U-value
0.12–0.15 W/m²K

Possible depending on construction, insulation and project requirements.

Airtightness
n50 < 0.6

Achievable with quality production, membranes and precise assembly.

Wall thickness
250–400 mm

Depends on insulation layer and structural solution.

What ZTC covers and what the project team reviews

  • ZTC provides the timber structure, insulation and membranes according to scope.
  • Windows, ventilation, heating and building form must be reviewed with architects and engineers.
  • A+ class depends on the whole building, not wall thickness alone.

An energy audit is usually carried out during the design stage to compare solutions before production and assembly.

What clients say about working with ZTC

Google reviews highlight structural quality and energy performance delivery.

Google review

We are Premium Living AS in Norway and built two houses with this company. We were very satisfied. We sold the last project 2 years ago when I write this review, and the first house was built 4 years ago. With both houses, the production, planning and timing all went smooth and well organised. Right now, all three buyers are pleased, and we haven't received a single complaint about flaws or even blemishes. Even during the Covid lockdowns there was no doubt that our investments and cooperation with ZTC were solid. We recommend, and anyone that has questions can ask ZTC for our reference.

Google review

ZTC built my house in 2012, and they have done some reclamation work in two periods since then. Only positive experiences with ZTC! Good quality of workmanship and customer support.

Google review

Ļoti profesionāls un ieinteresēts darbs no ZTC puses, lai maksimāli izpildītu klienta vēlmes mājas būvniecībā, ieguldot laiku visu detaļu precizēšanā, kā rezultātā pašas būvniecības laikā neko nevajadzēja koriģēt un ir tapusi patiesi kvalitatīva māja. Atzinīgus vārdus par mājas būvniecības kvalitāti saņēmām no visiem speciālistiem, ar kuriem sadarbojāmies vēlāk - liekot logus un durvis, jumta segumu un apdari. Paldies par paveikto un varam tikai ieteikt citiem izmantot ZTC pakalpojums māju būvniecībā! Pateicībā, Irēna un Janeks

ZTC technical reference points

U-value

Depending on construction, approximately 0.12–0.15 W/m²K is possible.

Airtightness

Quality structures can achieve n50 < 0.6.

Precise production

CNC precision of ±1 mm helps reduce assembly error risk.

Factory production

Panels are prepared in controlled conditions in the ZTC factory in Latvia.

A+ class and energy audit

A+ energy performance depends on the whole building — structure, windows, ventilation, heating and form. ZTC provides the timber structure and panel solution, while the energy audit result is defined during design together with architects and engineers. This helps choose scope before production.

Frequently asked questions

Questions about U-value, n50, A+ class, energy audit and timber structure solutions.

Planning an energy-efficient timber house?

Send project information so ZTC can review the structure and scope against your target.