Moist
Unventilated building elements should perform in inorganic materials.
SkanDek is unventilated elements where the supporting parts, between the vapor barrier and the roof membrane, is made of galvanized steel. In contrast to, for example, wood which can absorb water and nurture molds. Galvanized steel is an inorganic material, without these problems. At the same time Rockwool insulation material used in the elements, contain only a small amount of moisture (max 8 grams per cubic meters) as Rockwool has no capillary effect.
The unvented roof made of steel and mineral wool. (with a diffusion-proof vapor barrier, as well as condensation within a diffusion-proof roofing) Technically called tepid floor. There will have a linear variation of temperature, from close ambient to close indoor temperature at the underside of the elements.
Why unventilated?
It is suitable at ventilating steel roof elements, because outside cool air will cool down the sheet profiles, thus providing heat loss, as well as any condensation on the ceiling side.
SkanDek’s moisture technic work as a closed system where the little moisture that will always be in construction would wander up and down depending on the temperature conditions.
Ovenover ses en graf fra fugtsimuleringsprogrammet MATCH. Den konkrete sag er en svømmehal med græstag oven på SkanDek.
SkanDek steel roof element moisture technical review.
SkanDek has gotten consulting engineering firm Building and Environmental Technology A / S (BMT) to make moisture technical studies on a different type of SkanDeks steel roof element existing structures.
In their report, BMT concludes that:
“In the examined roofs constructions, there was no sign of moisture in the elements, and there are no indications that previously moisture in the elements. They inspected the items have not moistened at any time “.
Kirstinehøj
Measured RF: 58.7 to 64.4%
Administration, storage, and production.
The element appears without any visible traces of humidity, and all steel surfaces are shiny. The isolation of the element is dry.
Hadsund School
Measured RF: <100%
School and canteen.
On the upper side of the element between the outer insulation and the visible element traces of water. All surfaces of the element appear shiny and without evidence of moisture. The insulation in the element appears dry.
The swimming pool North West, Silkeborg
Measured RF: <100%
Swimming.
The element appears without any visible traces of humidity, and all steel surfaces are shiny. The isolation of the element is dry.
Egå Gymnasium
Measured RF: 55.4 to 60.3%
School.
The element appears without any visible traces of humidity, and all steel surfaces are shiny. The isolation of the element is dry
Fugtteknisk gennemgang af SkanDek ståltagelementer.
SkanDek har fået det rådgivende ingeniørfirma Bygge- og Miljøteknik A/S (BMT) til at lave FUGTTEKNISKE UNDERSØGELSER på forskellige typer af eksisterende tagkonstruktioner, med SkanDek ståltagelementer.
I deres rapport konkluderer BMT:
“I de undersøgte tagkonstruktioner er der ikke fundet tegn på fugt i elementerne, og der er ikke fundet indikationer på, at der tidligere har været fugt i elementerne. De besigtigede elementer har således ikke været opfugtet på noget tidspunkt”.
Kirstinehøj
Målt RF: 58,7 – 64,4%
Administration, lager og produktion.
Elementet fremstår uden synlige spor efter fugt og alle ståloverflader er blanke. Isoleringen i elementet er tør.
Hadsund skole
Målt RF: <100%
Skole og kantine.
På oversiden af elementet mellem den udvendige isolering og elementet ses der spor efter vand. Alle overflader inde i elementet fremstår blanke og uden tegn på fugt. Isoleringen i elementet fremstår tør.
Svømmebadet Nordvest, Silkeborg
Målt RF: <100%
Svømmebad.
Elementet fremstår uden synlige spor efter fugt og alle ståloverflader er blanke. Isoleringen i elementet er tør.
Egå Gymnasium
Målt RF: 55,4 – 60,3%
Skole.
Elementet fremstår uden synlige spor efter fugt og alle ståloverflader er blanke. Isoleringen i elementet er tør.
