Effective Protection Against the Elements

QUALITY AND OPTICAL appearance of a curtain wall are critically dependent on appropriate weather sealing. The individual elements are ultimately subject to extreme movements due to temperature changes, moisture (in the case of concrete), shrinkage of construction materials (wood, concrete), sound, wind and vibrations, which may affect the joints and adjacent elements.

PERFECT APPEARANCE
The joints between the elements may be effectively sealed with preformed gaskets or alternatively with UV and weather resistant silicone sealants. Sikasil® WS silicone sealants preserve the quality and perfect optical appearance of the facade in the long term, thanks to their outstanding advantages:
́ UV and weathering resistance
́ Improved impermeability to air anddriving rain
́ Very good movement absorption

DIMENSIONING OF WEATHERPROOFING JOINTS
In general
́ The joint edges must run parallel to a depth of twice the
joint width, but at least 1.18 inches. This gives the backing
material sufficient grip.
́ For most sealants, the joint width must be at least 4 times
the expected joint movement, which results from 25 %
movement capability
́ The optimal ratio of joint width to depth is 2:1
(see page 31 drawing top right)

PROJECT-SPECIFIC ADHESION TESTS
For weather-tight sealing of a curtain wall, it is essential to ensure optimum adhesion of the sealant to the surfaces. Before the sealant is used, it should therefore be individually tested for perfect adhesion to specimens of the project material at Sika’s FFI Competence Center.

INDIVIDUAL COLOR SCHEME
For weatherseals and natural stone sealants, Sika offers project-specific color matching services. In addition to the wide range of standard colors, see color samples on the right page, Sika also offers individual special colors on request. Please note that special colors are subject to special delivery conditions such as minimum order quantities and delivery times. Your Sika sales manager will be pleased to give you further details.

WEATHERSEALANTS FOR GLASS AND METAL FACADES
Sikasil® WS-295
́ High Performance
́ Non-Staining
́ Neutral curing
́ Weathering resistant
́ Meets the requirements of ASTM C-920, Type S, Grade NS,
Class 50/50, Use NT, M, G, A, O; TT-S-00230C, Type II, Class A;
CAN/CGSB-19.13-M87, AAMA 802.3 Type I,II, AAMA 808.3-08,
SWRI.

Sikasil® WS-305 AM
́ Ready-to-use one-part sealant
́ Neutral curing
́ Weathering resistant
́ Complies with ASTM C920 class 50, TT-S-001543 A, TT-S00230 C

Sikasil® WS-290
́ Ultra low-modulus
́ High movemenbt capability
́ Neutral curing
́ Weathering resistant
́ Complies with ASTM C-920, Type S, Grade NS, Class 100/50,
Use NT, M, G, A, O;TT-S-00230C, Type II, Class A; TT-S-001543A,
Class A; CAN/CGSB-19.13-M87; AAMA 808.3-08, Type I, II.
SWRI.