Isokern Double Module DM36 Chimney System Pack for render - 150mm (6") Diameter flue 4.5m High

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Isokern DM (DOUBLE MODULE) is the Market leader in Lightweight Pumice Chimney System. The double wall system helps retain the flue gas heat inside the flue system (where its meant to be), this helps maximise performance of the chimney stack effect and overall appliance performance. The simple design of a separate inner liner block and an outer casing help minimise heat transfer and allows thermal movement within the system, reducing the chance of cracking which can lead to flue leakage.

Lets take a look at the chimney system and some construction examples and a bit of information to help!  This is for DM36 which each out casing is 360mm x 360mm x 250mm high.

Here we will start at the bottom where you will be connecting to a closed appliance (most likely a stove, open Wood fires only from 200mm (8") flue diameter and upwards). You will normally start the flue using a Support block which sits onto Lintels or cast in situ concrete pad, the support block has a spigot on the underside which is designed for connection to your stove using the Isokern stainless steel adapter (choose the correct diameter or your stove.)

How to install Isokern Chimney blocks?. 
Once you have your suitable base/support block in place you glue the Pumice Chimney blocks and liners together using Lip Glue, On the first outer casing you will pace this lip up (Male Side Up), and the inner liner you will install a starter length (Socket / Female side up) which is 125mm high (half height), this places all subsequent liner joints above centrally to the outer casing, helping to ensure a tighter and more structurally sound chimney stack construction. When applying the lip glue is should be applied to approx. 12-15mm bead in the pattern below, when the next block is placed and positioned the final lip glue seal should be approximately 2mm thick 

Stainless steel wall ties are mandatory every 1.5m  for external chimney stacks and where the chimney stack becomes free standing as it travels through the roof structure. Internal chimney stacks are optional, however we still recommend the same, as its a minor cost saving to omit these and we prefer the belt and braces approach.

Passing through combustible floors or structures.