In the March/April issue of FCI, I opened the mailbag and answered ten of the more pressing questions regarding resilient flooring. Faced with an overwhelmingly positive response to that article, I thought it would be a good idea to put the same focus on commercial applications. Can you give me any tips on seaming linoleum?
Linoleum is a lot different to seam than sheet vinyl. Linoleum tends to shrink in length and grow in width. Seams should be cut slightly open on side seams and not on cross (end) seams. What are your thoughts on applying a tile adhesive over an existing cutback adhesive?
It depends on the circumstance. A cutback adhesive that is active (not scaly or poorly bonded) can be scraped down to a thin residue, and a clear thin-spread can be applied directly over the residue. Do not apply a cutback adhesive over a cutback adhesive, as they tend to create excess and will bleed. Beware: some old cutback adhesives contain asbestos. What are your thoughts upon applying latex adhesive over an existing latex adhesive?
There is a risk involved with applying an adhesive over an existing adhesive. Old latex adhesives were high in solvents and low in processing oils. The newer adhesives that meet VOC (Volatile Organic Compound) regulations are low in solvents and high in processing oils. In certain circumstances, when a new adhesive is applied over an existing latex adhesive, the oils are leached out of the new adhesive by the old, oil-starved adhesive. This causes the new adhesive to crystallize and become chalky and scaly, and consequently it will lose its ability to hold the material. Why does the heat-welded seam in linoleum appear weaker when compared to a vinyl seam?
The weld of a vinyl seam is a fusion between the vinyl in the material and the vinyl in the weld rod. In the case of linoleum, there is a bond by the rod rather than a fusion. This is why a linoleum heat weld is weaker than a vinyl heat weld. When laying VCT tile, I have instances where the tile tends to run. Can you tell me what causes this?
There are three basic causes to tile running:
There are two major factors that affect the strength of cementitious patching compounds: