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I assume you are trying to achieve a number of things
Make your workshop a bit warmer and more comfortable to work in
Reduce the risk of condensation and potential rust on your tools
Reduce noise transfer into the house

Noise transfer. You will need a dense acoustic rockwool or similar batt insulation. Lightweight cellotex wont have much effect. Also by insulating the garage/house wall you will effectively be making your workshop colder
General insulation. For the floor I would start with simple rubber tiles. Wikk make it feel warmer, nicer to walk on and kinder to any dropped chisels etc., Easiest to insulate the garage roof at ceiling level. Only issue is this creates cold roof space so not so good for storage of items. Use at least 50mm PIR or 100mm glass wool. For the wall use 50mm PIR with treated timber battens and OSB . There is a bit of a myth about cavities in this application. Brickwork is very slightly permeable and so will breathe out. OSB is almost airtight so there should mot be any issues
Your garage door will probably be the least insulated part of teh building and also have cold air leakage around teh edges
I assume most of your activities in teh workshop will be dry (youre not planning lots of seam bending etc)so a small amount of heat and/or a dehumidifier will reduce condensation risk. Keeping your tools in a closed cupboard will also help

<blockquote data-quote="Hornbeam" data-source="post: 1585518" data-attributes="member: 26379">I assume you are trying to achieve a number of thingsMake your workshop a bit warmer and more comfortable to work inReduce the risk of condensation and potential rust on your toolsReduce noise transfer into the houseNoise transfer. You will need a dense acoustic rockwool or similar batt insulation. Lightweight cellotex wont have much effect. Also by insulating the garage/house wall you will effectively be making your workshop colderGeneral insulation. For the floor I would start with simple rubber tiles. Wikk make it feel warmer, nicer to walk on and kinder to any dropped chisels etc., Easiest to insulate the garage roof at ceiling level. Only issue is this creates cold roof space so not so good for storage of items. Use at least 50mm PIR or 100mm glass wool. For the wall use 50mm PIR with treated timber battens and OSB . There is a bit of a myth about cavities in this application. Brickwork is very slightly permeable and so will breathe out. OSB is almost airtight so there should mot be any issuesYour garage door will probably be the least insulated part of teh building and also have cold air leakage around teh edgesI assume most of your activities in teh workshop will be dry (youre not planning lots of seam bending etc)so a small amount of heat and/or a dehumidifier will reduce condensation risk. Keeping your tools in a closed cupboard will also help</blockquote>

[QUOTE="Hornbeam, post: 1585518, member: 26379"] I assume you are trying to achieve a number of things Make your workshop a bit warmer and more comfortable to work in Reduce the risk of condensation and potential rust on your tools Reduce noise transfer into the house Noise transfer. You will need a dense acoustic rockwool or similar batt insulation. Lightweight cellotex wont have much effect. Also by insulating the garage/house wall you will effectively be making your workshop colder General insulation. For the floor I would start with simple rubber tiles. Wikk make it feel warmer, nicer to walk on and kinder to any dropped chisels etc., Easiest to insulate the garage roof at ceiling level. Only issue is this creates cold roof space so not so good for storage of items. Use at least 50mm PIR or 100mm glass wool. For the wall use 50mm PIR with treated timber battens and OSB . There is a bit of a myth about cavities in this application. Brickwork is very slightly permeable and so will breathe out. OSB is almost airtight so there should mot be any issues Your garage door will probably be the least insulated part of teh building and also have cold air leakage around teh edges I assume most of your activities in teh workshop will be dry (youre not planning lots of seam bending etc)so a small amount of heat and/or a dehumidifier will reduce condensation risk. Keeping your tools in a closed cupboard will also help [/QUOTE]

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