Typical putty jobs occur when laying power lines under plaster. The slots are completely filled. In most cases, a conduit protects the cable or cables as a channel. In other slots such as joints and transitions, any elasticity that may be required must be taken into account when trowelling, in order to prevent later tearing.
Slit types and material
The term slit for a structural condition is quite general. Both expansion and butt joints form slits as well as elongated wall depressions. As a delineation to the cracks, slits are required and desired depressions. Cracks, like holes, damage the building material and the surface.
In addition to the type and function of the slits, the host material plays a major role. Typical is the filling of concrete joints and the filling of joints in plasterboard. Less often, slots have to be filled on or in the floor. Screed edges need unfilled expansion edges and cables are rarely laid in the screed.
Shrinking and pot life
When declaring the putty to be self-explanatory, its drying properties must be taken into account. Cementitious putty such as mortar shrinks when dried. Apart from the formation of bumps, which are compensated by further puttying, the shrinkage behavior can damage cable ducts and cables. Many experts and experienced do-it-yourselfers swear by filling with Rotband, a very adhesive gypsum plaster that does not shrink.
An important factor is the processing time when filling slots. In doing so, as with the filling of holes, the total distance when mixing the putty should be taken into account. Approximately one hour work cycles or one to two meters slit length are common. The pot life of the putty must be adjusted by proportionally appropriate mixing.
In order to increase the workability and adhesiveness of the putty, moistening all surfaces coming into contact with the compound is recommended. Both the slot inner surfaces and inserted inserted cable channel elements can be moistened well with a dab or spray bottle.
Also the tool for filling from the spatula itself over stirring aids to smoothing instruments are moistened much easier to lead and to use. Generally, a diffusible filler should be used when trapping cables.Tips & TricksIf you fill slots with widths of two centimeters, special spatula belts can make your job easier.