BEVER GmbH now can look back to a 30 years old experience in production and development of joint elements for cavity brickwork, insulation materials and masonry fixings. Over the years innovation and involvement of the company and its employees led to a high technical standard what is testified by a large number of own patents and samples for use. Bever products are developed in close cooperation with users, architects and structural engineers.
The BEVER manufacturing and delivery programme:
- connection technology for cavity walls, insulation building materials and masonry fixings
- fasteners for roofing and facades
- fasteners for acoustics and interiors
- plugs and installation technology
For hard insulating materials
PU-Welle - a new plug cavity wall tie Product novelty of a new design approved by German construction supervision authorities
Hard insulating materials can now be easily and safely fastened with a new wire anchor in cavity walls. The wire anchor developed by the experts of BEVER GmbH is approved by the German Institute of Civil Engineering (abbr. DIBT).
The new plug cavity wall tie of PU-Welle model is a highlight of the company's presentation at BAU 2011 trade fair in Munich and Fastener Fair 2011 in Stuttgart. It is the only wall tie available now on the market which can be marked by the DIBT test seal. That means a safety advantage for planners, architects, installers, as well as for specialist dealers and proprietors.
License No. Z-21.2-1009 is based on DIN 1053 requiring that anchor wall ties must accept 1 kN tension and pressure load at 1 mm slipping. The average tension and pressure load of the plug cavity wall tie examined was approx. 3 kN in concrete. Load limits of the waved wire ties were approx. 2.8 kN pressure load and approx. 1.5 KN tensile load, at 1 mm slipping in each case, i.e. they also considerably exceeded the ones required by the DIN standard in the mortar joint of the outer masonry.
Additional safety and easy installation of wall ties are important advantages especially required today. Ultimately, everyone wants and must save as more energy as possible, when using new insulating materials, too. However EP and PU insulating materials are almost impossible to install with traditional cavity wall ties. The insulation is so hard that the wall ties cannot be pushed through it.
Unlike traditional wall ties, a PU-Welle plug cavity wall tie offers much more. It penetrates the insulation and is fixed in the backwalls e.g. made of concrete, or of lime sandstone. In this case, the borehole is accurately covered by an insulation clip of a suitable shape. A time-saving Welltec design used in the anchor is already proven in the practice. There is no more need of bending the wire in the facing masonry. The BEVER novelty is completed by a suitable drive-in pipe.
Do cavity wall ties cause thermal bridges?
Kirchhundem, April 2010
The more attention is paid to thermal insulation, the more undesirable are thermal bridges i.e. heat leaks caused by cavity wall ties. BEVER, a company specialized in fasteners and fixtures for cavity walls, examined this phenomenon by comparing results of tests conducted on two different products of the Bevers' current product range at the Technical University RWTH of Aachen. Multi-Plus cavity wall ties demonstrated the best results.
According to the Test Report, influence of thermal bridges caused by this type of wall ties of any dimension can be disregarded if the distance between two walls does not exceed 20 mm. That means, no extra thermal-insulation certificate is needed if deviations do not exceed 3%. The experts ascribe the good results to the small material cross-section.
Multi-Plus cavity wall ties are permitted to install within the thin-bed or normal mortar joints both in back-up masonries and in brickfacing. Furthermore, Bever's cavity wall tie of ZV-Welle type showed good results, too. Its heat leak effect can also be disregarded if the distance between walls does not exceed 15 cm. That is applicable to all anchor lengths.
The influence of thermal bridges was tested on a cavity wall with core insulations of lengths between 10 and 20 cm by determination of heat transition coefficients (U-values). Load-bearing internal leaves made of porous concrete and lime sandstone were compared. For more information on the product range, see www bever.de.