How to Install Glass Block

By eHow Home & Garden Editor

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Who says you can't live in a glass house? Glass blocks may be square or rectangular and can be used in any non-load-bearing wall where you want more light with privacy. Here are a few steps to help you install a glass block and let more light into your home.

Instructions

Difficulty: Moderately Challenging

Things You’ll Need:

Frame Installation

Step1
Install 1-by-2 board as framing for the blocks.
Step2
Nail it along the center of the space so that the blocks will cover the front and the back when they are set in place.
Step3
Put two coats of sealer on the wood to protect it from moisture.
Step4
Let it dry completely.

Mortar Installation

Step1
Bend the panel anchors into an L shape, with the short leg at about 3 inches.
Step2
Nail the panel anchors to the frame with the short leg parallel to the floor. Add a new panel anchor every third row.
Step3
Set a row of blocks with plastic spacers.
Step4
Follow the manufacturer's directions and mix the glass-block mortar.
Step5
Use a mortar knife to put a layer of mortar on the base or sill. You'll know you're using enough if the mortar squeezes out when you place a block on it.
Step6
Put the spacer into place, then slide the first glass block in.
Step7
Put a layer of mortar on the side of the next block and press it into place. Repeat for the entire row, then make sure the row is level.
Step8
Scoop up the squeezed-out mortar with a trowel, then wipe the glass with a damp sponge before starting the next row.
Step9
Finish three rows, then lay a line of mortar across the top.
Step10
Set a wire stabilizer on top of the mortar to reinforce the wall.
Step11
Set another layer of mortar on top of the stabilizer, put the spacers in place and continue laying the blocks.
Step12
Let the mortar dry for 24 to 36 hours, then caulk the outside edges to keep moisture out.

Using Prefabricated Panels

Step1
Lay a continuous bead of silicone caulk around the entire opening.
Step2
Center the panel and, holding it level, set it into the opening.
Step3
Tap roofing nails around the panel to hold it in place.
Step4
Slide a drip cap over the top if the panel is being used in a shower or bathtub.
Step5
Install the trim around the glass and enjoy!

Tips & Warnings

  • Clean up excess mortar with a dry scouring pad.
  • Don't put mortar on the jambs or over the spacers.
  • Be aware that preassembled glass block panels are very heavy.
  • Don't put glass blocks in areas where they will be required to support part of your home's structure. They are not designed for bearing loads.

Comments

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ToolGuy said

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on 6/19/2008 There is a product, like a clear rubber track, that you can use between the blocks. Acts as a spacer. You use it dry to get all the block stacked in place. Cut short pieces of the track for the vertical joints. Then caulk all the joints with silicone caulk. I think they sell it at Home Depot and probably at other stores that sell individual glass blocks.

BFunkey said

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on 10/2/2007 What about using silicone rather than mortar, for a "pane-less" or all-glass look?

pmpiper said

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on 7/3/2007 I think ths silicone caulk is a bad idea, it is hard to work with when it is time to repaint.
Use latex caulk instead, it is paintable easy to apply and it offers an excellant water seal. It is also easy to remove when repainting is needed.
Phil Piper

mikinzla said

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on 1/30/2007 how tall a window can you glass block, safely?? How wide?

mikinzla said

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on 7/11/2007 what is a panel anchor??

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eHow Article:  How to Install Glass Block

eHow Home & Garden Editor

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Category: Home & Garden

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