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Terrassbjälklag - En grön konstruktion utan fuktskador?
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2011 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Terrace floor - A sustainable design that eliminates dampness? (English)
Abstract [en]

In early summer 2010, Lars Källered of the company ISODRÄN AB, placed ten different structures of

terrace floor in the castle garden of Ulriksdal, Stockholm. The purpose of the project was to find a

design that could retain sufficient water so as to promote plant growth while the ISODRÄN layer (an

absorbent insulator) drained the excess water.

Terrace floor is a complex structure that is continuously exposed to variable weather, and as such, its

material properties can be affected. In order to keep the waterproof layer warm, it is necessary for

the design to maintain an even temperature between the thermal insulation and floor joists, so a

membrane, warmed from the above insulation, protects the joists. Temperature changes, however,

can render the layers susceptible to movement that can damage the membrane and lead to damp


The terrace floors built during the 1970s and 1980s are currently under renovation, bringing both

economic and design complications.

This thesis seeks to identify the damp damage and investigate how the structure should be designed

to reduce the damage to the underlying joists. The choice of materials is based on a literature

reviews, interviews, field studies, and laboratory experiments. The design of a terrace floor should

preferably be constructed as follows:




250 millimeters of pumice involved soil


5 millimeters of geotextile


100 millimeters of ISODRÄN layer


2,5 millimeters of Resitrix SK


2x10 millimeters of Asfaltmastix



The solution is an atypical construction, designed as an inverted roof where the thermal insulation is

placed above the waterproof layer. The terrace floor concrete must have a slope of at least 1:100,

directly onto which is placed the waterproof membrane (Asfaltmastix), a rubber carpet, ISODRÄN

layer, soil and plants.

The vegetation increases the durability of the waterproof layer as well as having a positive effect on

the city centre. Green roofs such as these beautify the urban landscape by compensating for the loss

of foliage on the ground.

Place, publisher, year, edition, pages
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-59731OAI: diva2:476162
Available from: 2012-01-12 Created: 2012-01-11 Last updated: 2012-06-01Bibliographically approved

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