Floor Screed Problems

With any screed problem we need to find out why your floor needs a screed repair in the first place and to treat the cause not just the symptom of why the screed has been damaged.

Floor screed problems.

It may be applied onto either a solid in situ concrete ground floor slab or onto a precast concrete floor unit. The video below gives a great demonstration of tradesmen in a house laying down ground insulation then underfloor heating pipes and then covering both with a screed which is produced with an incredibly. Because of the problems experienced with sand cement screed flooring a unique test method was developed by the building research establishment bre in the uk. This is useful for applications such as floors that need to slope to a drain or internal ramps.

Screed has been directly trafficked and damaged during the construction phase of a project. We have never had any problems we have just layed 250m2 of porcelain on the ground floor on liquid screed without any issues. Screeds provide a vital layer in a floor that bonds the finish people see and walk across to the concrete substrate of the building s construction. An advantage of semi dry screeds is that they can be laid at an angle.

As liquid screed drys from the bottom up we know by leaving a dinner plate over night if there is moisture then it is still wet to us the simple methods work. Lately there s been a rise in popularity for leaving the screed raw and untouched. Ensure the floor is fully dry the residual moisture level should be less than 0 5. Very dry screed mix or poor compaction however over wet screed mixes can lead to shrinkage problems and affect the flatness of the finished screed.

Screed mix containing less than the required amount of cement. Screeds are also used to increase the height of a floor. This will provide a dense surface to tile onto and will aid drying. The cured anhydrite screed will have a layer of laitance that will need to be removed after 2 6 days dependent on brand of screed used.

A floor screed is usually a cementitious material made from a 1 3 or 1 4 5 ratio of cement to sharp sand. Assess and prepare floor. We need to look at the possible reasons as to why it could fail and there is quite an extensive list but i think it is important to understand why.