U channels are often used to assist in applications where an opening has to meet a specific dimension.

It can also be considered if an opening has been prepared incorrectly and the dimension is too large. The figure can be reduced by incorporating an individually fabricated U channel.

Refer to data sheet GBT/0003 when detailing.

 It is crucial that the U channel is lined correctly with expansion fibre and when the channel is filled with glass block mortar at least two number stainless steel ribbed bars are inserted.

Ensure the glass block does not fit within the U channel.