ᐅ Insulating the roof: Loose-fill, boards, or batts

Hello.

We will be building a single-family house in 2016. Our budget is tight. Including a contingency, we have 300,000 euros available for 160 sqm (1,722 sq ft) (excluding landscaping, no basement, no carport). Our architects are currently preparing the tenders for the individual trades. As indicated in the subject, we need to decide soon on the insulation for the roof. For the thermal protection certificate according to the Energy Saving Ordinance 2014, 24 cm (9.5 inches) of mineral wool 035 was calculated for the roof. However, our architects recommend using blown-in loose-fill insulation instead. This is said to provide better protection against summer heat in particular. Since some of our rooms will have very high ceilings and extend right up to the roof, this argument could indeed be important. We are, however, concerned about the higher costs of loose-fill insulation and also worry that blown-in insulation might settle downward (pitched roof) causing a gap to form at the ridge.

What do you think? Are there any experiences regarding the costs and potential compression or settling of loose-fill insulation?

Thanks and best regards.

Does anyone really have experience with blown-in insulation in the roof?

Thanks and regards.

This works if you are familiar with the entire roof structure; in that case, you can forget about the underlay membrane (since it’s supposed to be cost-effective). Also, on the room side, precautions need to be taken to prevent the entire assembly from bulging. The flakes have a thermal conductivity of around 0.039 or 0.040 W/(m·K), depending on certification. This means that corrections or improvements will also be necessary.

This is not entirely related to the topic, but I still have a few questions about your financial scope.
Are the 300,000 € planned for both the house and the land, or just the house?
Is the 160 m² calculated including the walls, or excluding them?

stiff80 schrieb:
This might not be entirely on topic. But I still have a few questions regarding your financial scope. Are the 300,000€ planned for both the house and the land, or just the house? Does the 160 m² include the walls, or is it just the living area?

The 300,000€ is just for the house. The 160 m² (1,722 sq ft) refers to the living area (758 m³ (26,758 cu ft) of enclosed space). We already own the land.

3000 euros for 200m² (2,150 sq ft) blown-in loose fill.....