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

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.)

If you are positioning the chimney system immediately behind your stove ,in the room behind or outside then you will more likely create and installation similar to the image below. Here the chimney system can be built off a suitable floor construction/foundation and routed vertically to terminate at the required height. Your stove flue connection can be then routed off the top of your appliance at a 45 degree angle through the wall in between (suitably protected obviously and only using stainless steel flue pipe, In the UK we work to 3x flue Diameter for distance to combustibles, or 100mm of solid masonry in between the flue pipe and the combustible). You will create a space beneath the connection for access into the flue for sweeping and inspection by using a soot door. In the image you will also wee the re-enforcement rods which we recommend for the entire flue system, but are only mandatory when a free standing stack of above 1.4 metres high is present, where you will install the same length below as above the roofline, so generally 3m + of rods are required.

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.