Glass Blocks FAQs
25. How are they fixed to the wall?

The reinforcement bars penetrate the sidewalls to a depth of 40mm and act like a dowel. Consult your Roadstone Wood representative for further advice.

26. Where is the expansion fibre used?

It is used at the two sides and the top of the glass block panel. It is a 20mm joint instead of the usual 10/12mm joint. One uses 10mm expansion fibre plus a 10mm-mortar joint.

27. Why is expansion fibre needed?

It prevents movement in the building cracking the glass blocks.

28. How much mortar would one require for say 100 blocks?

About 5 bags all together of Glass block mortar would suffice. You will need one bag of the glass block mortar for pointing . It is important to use the correct amount of water when mixing. This is printed on the bag. This is to ensure the correct consistency of the mortar.

29. How should the glass block panel be reinforced?

Normally the glass block panel should be reinforced fully with high yield stainless steel rods horizontally and vertically every second course. However you may need to refer to your engineer if you have any specific queries.

30. What joints do you recommend?

Usually 10-12mm horizontally and vertically.

31. Are they load bearing?

No.

32. Are spacers available?

Yes, but they are not recommended for external work in case of water penetration.

33. Where should one have control and movement joints?

On the sides and head, also every 6M lengths. Advice can be obtained from you Roadstone Wood representative.

34. What should one use for reinforcing?

High Yield Stainless Steel rods (6mm and 8mm) are recommended, which are 3M in length. These are available ex.stock.