DerbyLad Posted December 14, 2020 Share Posted December 14, 2020 Hi All, My architect has specified 100MM PLASMOR FIBOLITE 3.6N BLOCK for the internal block work on my self build. A few of the builders that have quoted have raised concerns on this type of block saying that they will crack. I have had a few difficulties getting my SAP requirements and can see this opening up old wounds if I was to change this block. Would any of you have experience with this block? Is there an alternative with similar u-values that is stronger? Whilst looking at blocks I came across the Marmox Thermoblock for a single course to aid with thermal bridging. http://www.marmox.co.uk/learning-hub/reducing-thermal-bridging-in-wall-to-floor-junction-designs Has any one used these blocks? Thank you Link to comment Share on other sites More sharing options...
wozza Posted December 14, 2020 Share Posted December 14, 2020 We used 3.6n Fibolite without any issues. Ask the builders why they will crack and if they have used them before, are they confusing them with other blocks? Link to comment Share on other sites More sharing options...
Oz07 Posted December 14, 2020 Share Posted December 14, 2020 I don't think there are airated which they are perhaps being confused for Link to comment Share on other sites More sharing options...
Mr Punter Posted December 14, 2020 Share Posted December 14, 2020 The Fibolite blocks are made with expanded clay beads. They are not the aircrete crappy ones. The Marmox are good for a single course. Get your SAP person to let you know if they make any difference to your rating. Link to comment Share on other sites More sharing options...
bassanclan Posted December 14, 2020 Share Posted December 14, 2020 k = 0.24W/m°C for 3.6 N. k = 0.28W/m°C for 7.3 N So might be worth running the calcs for the difference Link to comment Share on other sites More sharing options...
DerbyLad Posted December 14, 2020 Author Share Posted December 14, 2020 Hi All, thank you for the replies Sounds like the builders were getting confused with the type of blocks, which is good news in a way! Mr Punter, have you used the Marmox block? Link to comment Share on other sites More sharing options...
Mr Punter Posted December 14, 2020 Share Posted December 14, 2020 35 minutes ago, DerbyLad said: Mr Punter, have you used the Marmox block? Not yet but have spec'd it for a forthcoming project where we have to get a minimum 19% C02 improvement over part L 2013. I was also looking at Foamglas but the Marmox looks cheaper and has higher compressive strength. Link to comment Share on other sites More sharing options...
Vijay Posted December 14, 2020 Share Posted December 14, 2020 I went with Marmox Thermoblocks which are being delivered tomorrow Link to comment Share on other sites More sharing options...
Vee6 dan Posted December 14, 2020 Share Posted December 14, 2020 I’ve laid them before. Not too bad to lay, they are only for one course round the bottom tho aren’t they and then normal blocks above Link to comment Share on other sites More sharing options...
Brickie Posted December 15, 2020 Share Posted December 15, 2020 A lot of old school Brickies have been schooled to have the mortar far too strong for blockwork which can cause cracking-they then consider the blocks to be too weak without considering the mortar strength. Link to comment Share on other sites More sharing options...
DerbyLad Posted December 15, 2020 Author Share Posted December 15, 2020 Thanks everyone. Looks like I'm ok with the Plasmor block. Regarding the Marmox block, I have asked my SAP guy for his thoughts on how much difference they would make to wall u-values and my overall SAP. Thank you Vee6 dan it's good to hear they are quite straight forward to lay and yes, just for one course Link to comment Share on other sites More sharing options...
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