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New windows - crumbly in corners?

i have a new window fitted.

in the bottom corners they have cement this is very crumbly when you touch it could this be due to sand/cement mixture error

2 Answers from MyBuilder Bricklayers

it sounds like the mortar used has been mixed very weak, it should have been mixed at a ratio of 3 parts sand and 1 part cement


Answered 26th Apr 2012

Debatable wether you'd use 3:1 or 4:1. Could also have been affected by cold weather when the work was done. If mortar freezes before it sets, it will not set properly thus making it extremely weak.


Answered 11th Jun 2012

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