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AFTERCARE & MAINTENANCE
General Maintenance
& Cleaning of
WBS External Wall
Insulation Systems & WBS Polymer Cement Renders
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Addition
of Metalwork
Any metalwork to be added to the building such as clothes
lines, hooks, etc, should be well painted or otherwise
protected if they are made from a ferrous metal. Attachment
to the building should be made with fixings, which penetrate
through the system and into the substrate, for example,
sleeved bolts or extended length fixings. These should
be sealed at their abutment with the system using a
good quality acrylic sealant. |
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Waste
Pipes
Any additional waste pipes, etc, which penetrate the
system should be passed through holes cut a maximum
of ¼“ (6mm approx.) larger than the pipe
diameter, which can then be sealed between pipe and
system, using good quality acrylic sealant. |
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Aesthetic
Additions
Choose carefully any further additions to the property
that are to be added on after the insulation is complete,
for example, canopies. Try to avoid types with; for
example, stained mounting brackets, which are open to
the weather. “Drain-off” from these types
will stain lightly coloured finishes. |
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Property
Extensions
Any additions to the property, for example, outhouses,
lean-to’s, should be sealed where it abuts the
addition using a good quality acrylic sealant. |
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Over Painting
Although the system is a long life, minimum maintenance
one, should the colour of a painted finish require to
be changed or re-painted, then a good quality, water
base and vapour permeable masonry paint should be used.
Generally, 2 coats would be required to give sufficient
coverage. Care should be taken to avoid the use of dark
colours in large areas, as the solar heat absorption
in these colours is much greater than in pastel and
lighter shades. |
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Door Redecoration
Should paint stripping at doors or windows using a blow
lamp or similar be carried out, then some protection
of the adjacent system be afford to prevent discoloration
of the surface, particularly a painted one and damage
to the sealant at the junction of the system. |
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Replacment
of Existing Windows
Where doors or windows are to be replaced after application
of the system, care must be taken not to damage the
system in the reveals on removal or replacement and
the new door/window should be resealed against the system
using a good quality acrylic sealant. |
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Addition
of New Doors / Windows
Where new doors, windows or other openings are to be
cut into the structure, the system must be layered back
by 150mm per layer of material in the system away from
the opening. New WBS materials should be applied in
sequence neatly back to the new fitment or opening. |
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Grafitti
Removal
If graffiti vandalism is a problem, then specialist
anti-graffiti treatments are available, details of which
may be obtained from WBS. |
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Removal
Of Small Stains
Any small stained areas, which do occur, can be treated
with a semi stiff (scrubbing type) brush and warm water
containing a household detergent. Work from the centre
of the stain outwards to achieve evenness of colour
and finish and rinse well. |
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Garden
& Plant Considerations
Keep garden soil levels as far below the system level
as possible as soil splashing will soon discolour the
base of the system.
Plants, trees and creepers can cause staining of lightly
coloured finishes and care should therefore be taken
in the positioning of them.
Climbing plants, provided they have a properly fixed
trellis available for them will not cause any damage
to the system. However, they may cause some staining
of lightly coloured finishes. |
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Satelitte
Dish Installation
If fitting a satellite dish or receiver to completed
areas of External Wall Insulation, either of the 2 methods
outlined here should be adopted:
i) Drill out appropriately sized holes through the system
back to the wall surface and insert cylindrical non-corrosive
tension spacers at the relevant dish fixing points.
The support bracket for the dish may then be installed
as normal but should be tightened against the spacers
and not the system. Silicone sealant must be neatly
applied around the spacers to ensure water penetration
is prohibited.
ii) Obtained suitably sized treated timber blocks that
are at least 15mm thicker than the overall system thickness
and will safely accommodate the dish bracket.
Use these blocks as a stencil and neatly cut out the
system at appropriate fixing points back to the original
surface. Insert the blocks and secure to the structure
with non-corrosive mechanical fixings. Apply silicone
sealant between the blocks and the surrounding system
finish to prevent water ingress.
The dish’s brackets may then be screw fixed to
the timber blocks. |
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General
Considerations
Don’t lean metal objects against the system. Rust
staining can soon disfigure the finishes, particularly
lightly coloured ones.
Dripping overflows and splashes from leaking gutters
and down-pipes can soon mark and spoil a new finish.
Such leaks should be repaired as soon as possible.
Don’t reverse vehicles up to walls with newly
applied finishes on as exhaust emissions quickly leave
unsightly black marks.
Care should be taken when handling heavy objects, for
example dustbins, near the system. Although the system
is resistant to damage, these types of objects particularly
near corners can cause damage, which is visibly undesirable
although easily repairable. |
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Repairs
- WBS Render Only Systems
Where small repairs are required to be made to the system,
such as localised damage, they can be performed in line
with the specifications covered under sections which
follow.
Hairline Cracking
As with all Cementitious
render products a small amount of hairline cracking
can be expected particularly at openings to doors, window
frames etc. Any cracks larger than the thickness of
a credit card should be investigated further. Please
consult with WBS Technical Staff.
Specifications
For The Completion Of Minor Repairs to The System Finishes:
a) Minor damage to Decorative Dashed Finish only:
- Remove loose material and
wire brush.
- Check that reinforcing mesh
is not damaged.
- Patch with WBS Dashing Mortar
and dry mineral aggregate of type to match
existing.
b) Damage to Full Depth of Renders:
- Remove loose material and
renders from damaged areas.
- Grind back all renders for
a minimum of 150mm in all directions beyond damaged
areas and onto undamaged
areas of render and reinforcing mesh.
- Trowel apply a coat of WBS
Scrim/Mesh Adhesive of a minimum thickness of 3mm
to the entire surface
of the exposed insulation board or reinforcing mesh.
- Lay into the wet Scrim/Mesh Adhesive
a covering layer of WBS Reinforcing Mesh
Cloth cut to fit neatly
into the exposed area and overlapping onto sound existing
surfaces by a minimum
of 150mm in all directions.
- Re-dash surface with WBS Dashing
Mortar and dry aggregate to match existing, or:
Apply coat of WBS
Smooth Render and Texture Coating Finish and work with
roller to match existing
texture as close as possible |
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Repairs
- WBS Insulated Render System
Specification
for the Completion of Repairs to the Depth of the
Insulation System:
a) Damage to Full Depth of Insulation System:
- Remove damaged materials
back to the original structure.
- Cut off any mechanical fixing
pins level with the original structure and trim edges
to
produce straight joints.
- Grind back for a minimum
of 150mm wide onto undamaged areas taking care not
to
disturb reinforcing
mesh.
- Apply WBS insulation to
exposed area; insert system fixing pins at maximum
distance of 500mm in
each direction and from 150mm from each edge.
- Apply a coat of WBS Scrim/mesh
Adhesive to insulation at a minimum thickness of
3mm together with thin
coating to exposed reinforcing mesh previously ground
areas. Trowel into
Adhesive one layer of reinforcing mesh to fully overlap
existing
undisturbed reinforcing
mesh.
- Re-dash surface with WBS
Dashing Mortar and dry aggregate to match existing,
or:
Apply coat of
WBS Smooth Render and Texture Coating Finish and work
with roller
to match existing texture
as close as possible. |
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Redecoration
of the WBS External Wall Insulation System
The WBS External Wall Insulation System with Texture
Coat Finish or Masonry Paint Finish can be redecorated
by applying smooth masonry paint evenly over the surface
to ensure that the moisture vapour permeability of
the system is retained.
To ensure this happens, only paint obtained through
Wetherby Building Systems Limited should be used.
If it becomes necessary to disturb the WBS External
Wall Insulation System for any reason, such as to
replace a window or insert a pipe through the wall,
satisfactory repair can be affected by following the
instructions within this document. To ensure a sufficient
watertight seal, a suitable sealant should be applied
between the system and the new item before the final
coat of mortar is applied.
Patching of rendered and textured finished will nearly
always be visible. It is permissible to re-dash over
the existing dash finish using WBS Dashing Mortar
and dry mineral aggregate between existing joints
to obtain a uniform appearance if required for aesthetic
purposes. Alternatively, a coat of smooth masonry
paint can be applied over the whole of a texture coated
are for the same purpose. |
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Should any further
advice be required on any maintenance related topic,
then this may be obtained from Wetherby Building Systems
Limited.
Please remember –
All repairs are best undertaken by professional tradesmen
with experience of the materials and systems.
Wetherby Building Systems Limited will always advise
of local companies with experience of our products
and systems.
Workmanship that is poorly carried out will not only
spoil the appearance of the products but may also
adversely affect the life expectancy of the system
and the product warranty. |
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Recipients
of WBS products must take responsibility for existing
laws and regulations and at all times operate within
Health and Safety guidance on the use of these products.
The information provided within this page is deemed
to be accurate to the best of our knowledge and given
in good faith. |
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