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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

2012-04-26T21:20:02+01:00

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.

2012-06-11T10:25:03+01:00

Answered 11th Jun 2012

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