With selected products ■ Stop lateral moisture penetration into basements
from the Vandex ■ Provide a dry space
■ Utilise dormant or useless space
product range, it is
■ Add value to the property
possible to; ■ Upgrade space for more sophisticated use
■ Avoid external excavation as the application can take
place from inside the building.
As well as waterproofing existing basements, Vandex
products can also be used in new construction and detailed
speciﬁcations can be obtained by contacting Vandex (UK).
Upgrading a basement Properties undergoing refurbishment frequently have
basements that will need upgrading to create a drier
These basements may be used for storage, ofﬁces, bedrooms,
plant rooms etc., which all require different levels of dryness.
What is dryness? pose a problem for the inhabitants or 20° C with no damp patches but a
contents of that building. relative humidity of 75 % would be
Buildings/structures are not always considered damp because paper
dry, water and water vapour will For example; a car park at 14° C,
would curl and the inhabitants
always exist bound up in the which has a few minor damp
would ﬁnd the atmosphere
building materials and in the air. The patches in corners and a relative
building can be perceived as being humidity of 75 %, may be perceived
dry if the water present does not as being dry, whereas an ofﬁce at
The following table gives a rough guide to environmental requirements:
Usage Some moisture tolerable ? Temperature (°C) Relative Humidity
Car Park Yes As External As External
Ofﬁce No 20 60%
Archives No 15 40%
A comfortable ventilation. If this is not done the by the British Cement Association in
moisture introduced into the conjunction with the British Structural
basement by people, boiling Waterprooﬁng Association).
There are three criteria which need kettles etc., will allow the humidity In order to achieve a Grade
to be addressed in order to make a to build up to levels exceeding 4 environment, air conditioning or
basement ﬁt for a speciﬁc purpose: those considered advisable for dehumidiﬁcation is essential. (Ref.
■ Control water/moisture in the the chosen environment. Very often, Table 2.2 of the Ciria report C319,
building structure relative humidity is controlled via Water Resisting Basements). On the
■ Control the relative air humidity an air conditioning system. rare occasions when water vapour
■ Control the temperature is moving into the basement, this air
■ The area will then need to be
heated. Again, this can often be conditioning or dehumidiﬁcation
achieved by expanding the will remove it with ease.
The upgrading existing heating system into the
process basement. The use of VANDEX BB 75 in the
The above mentioned criteria can be circumstances described, to provide
met through the following courses of a structural waterprooﬁng system,
action: Using VANDEX BB 75 will fulﬁl the requirements of
to achieve a grade BS8102 to achieve a Grade
■ To begin with, any moisture
4 environment, when used in
penetration must be stopped. 4 environment
conjunction with the appropriate air
This can be achieved by VANDEX BB 75 is vapour conditioning or dehumidiﬁcation.
applying VANDEX BB 75 as a permeable, i.e.,it allows the
waterproof coating to the inside passage of water vapour.
walls and ﬂoors. This can then be Vapour pressure charts show that
followed by insulation and water vapour does (in most
decoration as appropriate. circumstances) actually move out of
■ Following the waterprooﬁng/ the basement towards the ground,
damp-prooﬁng work, the air although this is not always the case.
needs to be conditioned and In any event, the amount of vapour
circulated to ensure the relative which migrates through basement
humidity falls within acceptable walls is so little as to be of no
levels. This can often be consequence. (Ref. Waterprooﬁng
achieved by providing adequate Basements Design Guide, produced
Design speciﬁcations Application guidelines
(please refer to the relevant product application guidelines)
1) Brickwork basement
Wall A) Substrate preparation
3:1 sand/cement mortar Remove existing plaster, coatings or loose particles, which would inhibit
VANDEX BB 75 bonding, down to bare concrete or masonry. The substrate must be sound,
4:1 render, 1:1:6 lime plaster or
cementitious renovating plaster
clean and well keyed. If necessary the substrate can be prepared by suitable
VANDEX UNI MORTAR1 ﬁllet
mechanical means such as grit blasting, high pressure water jetting or bush
Concrete Slab hammering.
Any other foreign bodies within the structure that could cause disruption, such
as timber or steel, must be removed. Rake out mortar joints to a depth of
approximately 20 mm. Thoroughly clean the walls by wire brush or other
suitable means and immediately sweep up resulting debris from the ﬂoor,
2) Brickwork basement with reinforced concrete joint
before it can cause any further contamination.
Wall Apply a layer of VANDEX UNI MORTAR 1 (minimum layer thickness of 5 mm)
3:1 sand/cement render onto the pre-wetted substrate. Alternatively, a nominal 10 mm thick – 3:1
VANDEX BB 75
4:1 render, 1:1:6 lime plaster or sand/cement render can be applied.
cementitious renovating plaster
100 x100 x 2.5 mm VANDEX
BB 75 E reinforced using B) Salt treatment
JOINT TAPE Screed If the substrate is contaminated with salts:
Slab ■ For nitrate contamination, apply VANDEX ANTI NITRATE in
accordance with the VANDEX ANTI NITRATE standard speciﬁcation.
■ For sulfate contamination, mix 8 kg of VANDEX ANTI SULFATE with
1 bag (40 kg) of VANDEX ROUGH CAST.
3) Concrete basement (new/existing)
Concrete Wall C) Waterprooﬁng/Damp-prooﬁng
Please refer to the application guidelines for VANDEX BB 75 for waterproo-
VANDEX BB 75
ﬁng/damp-prooﬁng walls and ﬂoors.
VANDEX UNI MORTAR 1 ﬁllet
D) Joints and cracks
Concrete Slab Depending upon the construction principles used and the nature of the buil-
ding structure, the following solutions should be applied.
■ Static cracks and joints – are chased back to form a uniform rebate
slurry coated with VANDEX BB 75 and ﬁlled ﬂush with VANDEX
UNI MORTAR 1. For wall/ﬂoor joints, a ﬁllet of VANDEX UNI
4) Concrete basement subject to movement (new/existing)
MORTAR 1 may be applied as an alternative.
■ Joints and cracks with minor movements – should be
VANDEX UNI MORTAR 1
sealed using VANDEX CONSTRUCTION JOINT TAPE bonded with
VANDEX BB 75 VANDEX BB 75 E.
Bonded with VANDEX FLEXTAPE ■ Movement joints – should be sealed using VANDEX FLEXTAPE
Concrete Slab bonded with VANDEX FLEXTAPE ADHESIVE.
Applications with cementitious Vandex products should be protected from
frost, wind, direct sun and rain during setting and hardening.
For individual technical solutions The application should be kept damp for a period of at least three days.
or alternative design speciﬁcations, Cementitious Vandex products are fully cured after 28 days.
please contact Vandex UK Ltd.
Plastering and Cementitious tanking systems are vapour
permeable. As vapour movement is
the binder/pigment ratio, the higher the
vapour resistance of the paint. Problems
decoration usually from within the basement out may therefor be experienced when these
towards the ground, this is an advantage. paints are used and they should be
There may be occasions however, when avoided in basements.
Areas below ground level are prone to
the vapour movement is reversed and
condensation and obviously this will Trade Matt Emulsions have a lower
it moves from the ground into the
usually occur on the coolest surface, binder/pigment ratio and a high vapour
which would normally be the VANDEX permeability which means that residual
BB 75 coating and that condensation It is important to ensure that any moisture in new plaster can escape.
would affect Gypsum based plasters. decorative covering over the tanking Mineral paints, which combine with the
No incompatibility exists between system is sufﬁciently vapour permeable surface of mineralic substances such as
VANDEX BB 75 and Gypsum based to prevent a build up of humidity. If it is plaster or render, also have a high
plasters. However, it is recommended not, interstitial condensation could occur vapour permeability. Either of these
that VANDEX REFURBISHMENT PLASTER within the plaster layer supporting the paint types is recommended for use in
be used over the VANDEX BB 75 before decoration resulting in bubbling and basements.
applying any ﬁnishing plasters. peeling of the covering.
As a guide, if the paint is suitable for use
If it is important that a ﬁnishing plaster is It is generally appreciated that gloss over new (damp) plaster it is also
applied directly onto the VANDEX BB 75 paints should not be used over a tanking suitable for use over VANDEX BB 75. If
then steps must be taken to ensure that system, but it is commonly thought that in doubt, the paint manufacturer should
condensation does not cause problems. water based emulsion paints are be contacted.
After lateral penetration of moisture has Advanced paint technology, however,
been stopped in a basement, it may has resulted in much higher binder/
need to be decorated. pigment ratios, (Vinyl Matts). The higher
Vandex Product Range for Basement Construction
Scope/ Substrate Neutralising Waterprooﬁng Sealing Re-plastering Movement
Vandex Product Treatment preparation harmful salts damp-prooﬁng construcition walls joints and
walls and joints and and live
ﬂoors cracks cracks
VANDEX UNI MORTAR 1 or
SAND AND CEMENT MORTAR
VANDEX ANTI-NITRATE ●
VANDEX ANTI-SULPHATE ●
VANDEX BB75 ●
JOINT TAPE & VANDEX BB 75E
VANDEX REFURBISHMENT ●
VANDEX FLEXTAPE and
VANDEX FLEXTAPE ADHESIVE ●
For consumption values, technical data and application guidelines please refer to the product data sheets and product application guidelines.
Q U A L I T Y
Visit our Homepage www.vandex.com www.vandex.co.uk
The information contained herein is based on our longterm experience and the best of our knowledge. We can, however, make no guarantee since for a
successful outcome, all circumstances in an individual case must be taken into consideration. Indications of quantities required are only averages which in
certain cases might be greater.
HEADOFFICE AND INTERNATIONAL SALES: PRODUCTION AND LOCAL SALES: LOCAL SALES:
VANDEX INTERNATIONAL LTD VANDEX ISOLIERMITTEL GESELLSCHAFTm.b.H SAFEGUARD EUROPE LTD
P.O. Box, CH-4501 Solothurn/Switzerland Postfach 1406, D-21487 Schwarzenbek/Germany Redkiln Close, Horsham, West Sussex, RH13 5QL, UK
Phone ++41 32 626 36 36, Fax ++41 32 626 36 37 Phone 0 4151 89 15-0, Fax 0 4151 89 15 50 Phone +44 (0) 1403 210204, Fax +44 (0) 1403 217529
E-mail: email@example.com http://www.vandex.com E-mail: firstname.lastname@example.org http://www.vandex.de Website: www.safeguardeurope.com