How to Make a Fireproof Insulation Wrap
Installing a fireproof insulation wrap in the chimney enhances safe removal of combustion products from the fireplace and also prevents fire hazards in the home. There are different types of fireplaces which include open fire, closed stoves or solid flue effect gas fires. The type of insulation used affects how flue gases are kept warm in the chimney. This has an effect on how well energy is preserved in the system. Brick liners can serve as a fireproof insulation wrap. They are affordable, effective and durable. Simple ones can easily be made at home.
Step 1 – Assemble Necessary Material
Use a shovel to scoop quality clay soil from the garden. Keep in mind that clay feels slippery, sticky and greasy. It is advisable to dig a few centimeters into the ground to get good quality clay.
Another idea is to buy ready to use fireclay. Get approximately 5 kg clay soil by obtaining 2.5 Kg fireclay and 2.5 Kg grog. Buy sawdust as well.
Obtain a hinged former. This can be made from flat mild steel. Measure it to form a 40mm by 80mm hinged former, this will form 180 by 90 by 40 cubed bricks.
Step 2 – Prepare the Clay
Prepare the 2.5 Kg fireclay and 2.5 Kg grog by mixing it with 50% of that volume of sawdust. Add a little amount of water at a time and mix the materials properly. Let it dry completely to get a consistency similar to tempered molding sand.
Step 3 – Prepare Bricks
Get the dry clay mixture and remove large sized particles, sand, wood shavings or pieces. Use a sand sieve to get best results. Place the mixture on a wheelbarrow and add small quantities of water and continue working the mixture using a shovel. Add water until the dough is soft and smooth; knead it to remove excess air.
Step 4 – Cut Out Bricks
Use the steel hinged former to make even sized bricks. Knead an adequate amount of fresh mound of clay and carefully push the hinged former through the mixture. Use a blunt knife to cut excess clay from both side of the hinged former.
Place the cubed shaped bricks on a clean, cool and dry surface. Repeat the process until enough bricks have been made. Leave them to dry for about 24 hours to ensure water loss.
Step 5 - Oven Dry Bricks
Warm the brick oven and carefully place the dry pieces to fit in comfortably in the available space. Take care not to overlap or put in too many pieces. Fire the bricks up to 1,200 degrees C.
Leave the bricks in the oven for approximately 3 hours; let it dry before removing and loading them on to a clean surface. Look out for well formed bricks and separate them from broken or damaged pieces. These can be installed as an insulation wrap in the chimney.