Wall ties are used to connect the interior wall through the insulating material (and the air-gap clearance) with the exterior wall and to make them a single coherent unit.
Wall ties are considered to be “flexible” due to the engineering specifications of a threeply wall.
The interior part of the wall is facing the room, thus its temperature and geometry are not subject to considerable fluctuations. Which is not the case with the exterior wall: in summer it can warm up to 70ºС, while in winter it can cool down to minus 40-50ºС. Temperature fluctuations change geometry of the wall. The interior wall remains steadfast while the exterior wall “moves”, therefore the wall ties bend (thus the wall ties are considered to be “flexible”). For this reason stability of wall connection and therefore reliability of the whole construction object depend on the specifications of the raw materials used for production of wall ties.
Construction rules and regulations SNiP II-22-81 “Masonry and Reinforced Masonry Constructions”, art. 6. 31 stipulate that: “Wall ties should be produced of corrosion-resistant steel or steel with corrosion prevention treatment as well as polymer materials.” Composite materials are used as polymer materials, i.e. basalt and fiberglass reinforced plastic.
According to this SNiP it is dangerous to use wall ties made of rebar that is not corrosion-resistant, rebar produced of ferrous materials as well as wire, because corrosion of these materials may cause destruction of exterior walls and thus impairs safety of the building. Such state of the building is hazardous, and it is no longer safe to live in the building, because the building or a part of it can fall down (picture 2). It takes time and investment to repair dangerous buildings, which is impractical and unprofitable.
Energy performance of buildings and constructions is a topical question in Russia today. That is why thermal conductivity is one of the most important specifications of wall ties: the lower the index of thermal conductivity is, the less warmth escapes through the wall tie and no thermal bypasses are formed. Thermal bypasses are the places where rebar is laid in the wall, the places where heat losses occur and where moisture is condensed. Thermal-imaging of a threeply wall shows numerous dark orange dots – thermal bypasses – places, where metal wall ties are positioned (picture 3). It should be noted that when wall ties of composite materials are used, no thermal bypasses are formed and heat loss is reduced by as much as 34%, which considerably reduces heating expenses.
How to order masonry wall ties.
Our company welcomes new partners. To place an order for masonry wall ties or other materials, please, use our phone number in Yaroslavl: +7 (4852) 68-14-15, or send us an E-mail. It’s easy to reach us!