34
Maintenance, cleaning and lubrication
Expected
result
Function
class
Comments
Visible
surfaces of
closed ele-
ments
DLG**
III
Mean value of
coating thick-
ness > 60 mm
(80
mm)
Visible sur-
faces of open
elements
DG**
III
The surface
must be non-
absorbent
Non-visible
surfaces
(
against wall)
No require-
ments
References:
Examples:
*
Function class III
Parts of buildings facing
south or west, affected by
varying levels of humidity,
pollution from traffic or
other aggressive impacts.
See also supplementary
description of outcome.
**
Coverd, closed and
smooth surface (DLG)
Surfaces, edges and
rebatesare of a uniform
colour andgloss and feel
smooth tothe touch. Rough
spots originatingfrom the
base may occur. Pores,
holes, cracks and joints are
closed, but not necessarily
filled out.
***
Covered and smooth
surface (DG)
Surfaces, edges and rebates
are of a uniform colour
and gloss and feel smooth
to the touch. Rough spots,
open pores, holes, cracks
and joints originating from
the base may occur.
All surfaces have been treated, but a uni-
formcoating thickness cannot be expected.
Supplementary description of outcome
Wood is a natural material and therefore of-
ten very heterogeneous. Variations in struc-
ture and gloss, star shakes and other variati-
ons are normal such as irregularities around
knots where partial peeling, blistering and
wrinkling may occur. Discolouration from
knots may occur, especially on light colour fi-
nishes. Knots may be plugged or filled with a
suitable filler, but they will always be visible.
Other colour variations such as yellow lines/
surfaces may occur. Other irregularities such
as lumps of resin may also appear in the sur-
face treatment. The lumps may be randomly
spread out or situated along the wood grains.
The resin may also penetrate the coating
and form little droplets on the surface. After
a while, when the droplets have crystallised
on the surface, they can be lightly brushed
or scraped off without damaging the surface
treatment.
Wood elements with a high content of resin
may occur. In such cases, larger quantities of
resin may seep through. Production is car-
ried out industrially providing benefits such
as uniform, high quality and treatment of all
surfaces.
If nothing else has been agreed, glazing
beads, etc. have been mounted using a nail
gun whichmeans that the surface treatment
has been penetrated. For further advice on
maintenance, please consult the paint ma-
nufacturer.
For facades facing south that
are exposed to strong sunlight
and sea air or moisture from inside
the building maintenance intervals
should be adapted to the conditions.
