Elise Aglietta

The Building

Building pre-intervention

Building post-intervention

Building post-intervention: Aus Fotodok_6.jpeg

The Rainhof is a listed rural building located at the end of the Gsiesertal valley, at 1,500 m above sea level. It is one of the most precious rural buildings of the area and it is placed just off the main road in a prominent position. The ground floor was built with solid stone masonry walls, whereas first and top floor were built with the vernacular “Blockbau” (solid wood) construction technique. The building presents many traditional features, such as windows with deep reveals, decorative painted frames around the windows, and a vaulted ceiling at the entrance. The building was designed and used following the layout of the “Paarhof”, a traditional design of rural agricultural dwellings in South Tyrol where the dwelling and the farm building stand independently. The main building was designed to accommodate three generations, the ground floor was used as living room and kitchen on one side and workshop and pantry on the other side. The entrance/corrifor was used for animal slaughtering, whereas the rooms upstairs were dedicated to the bedrooms for the family and farm workers.

More Details

The Solution

What is the Solution?

Insulation of the former "cold" pitched roof and improvement of the supply of daylight in the two holiday apartments in the attic.

Why Does it work?

The insulation was applied internally to maintain the existing wood shingle roof. Two glass bands were installed in consultation with the heritage office

PROS

The former cold roof became a warm roof and could be turned into apartments.
The existing wood shingle roof could be maintained.
The cost of this solution is lower compared to a solution necessiting to raise the roof line for example.
Drastic improvement of the U-value.

CONS

Worthwhile improvements in thermal performance will only be achieved if the rafters are deep enough to accommodate a thick layer of insulation.

Insulation material

Wood fibre and Mineral wool

Insulation thickness

Wood fibre: 180 Mineral wool: 60

Thermal conductivity

Wood fibre: 0,04 Mineral wool: 0,036

Health issue

information not available

Technical drawings

D1.jpg

Installation Method

The insulation was applied internally to maintain the existing wood shingle roof.

Moisture Management and Technical Compatibility

information not available

Airtightness

information not available

Before retrofit

After retrofit

Before retrofit

Roof thickness

335

After retrofit

Roof thickness

430

Before retrofit

Roof build-up

Wood shingles [15mm], Sub-structure wood [110mm], Wooden casing [30mm], Rafters [180mm]

After retrofit

Roof build-up

Wood shingles [15mm], Wooden battens [30mm], Counter battens [80mm], Underroof membrane (type Stamisol ECO), Rough boarding [25mm], Rafters with wood fibre insulation in-between [180mm], Vapor barrier, Mineral wool insulation [60mm], Battens [25mm], Gypsum fiberboard [15mm]

Before retrofit

U-value

2.7

After retrofit

U-value

0.2