Use some QuitBrace insulating board covered with Reflectix heat shield thin-sulate
Insulatinion Link
<a href="http://www.amazon.com/gp/product/B002S4TPP2/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative =9325&creativeASIN=B002S4TPP2&linkCode=as2&tag=aff iliatechie-20">Extreme Dynamat Xtreme Bulk Pack Heat & Sound Deadening</a><img src="http://www.assoc-amazon.com/e/ir?t=affiliatechie-20&l=as2&o=1&a=B002S4TPP2" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />
Reflectix Link
<a href="http://www.amazon.com/gp/product/B000BQSYRO/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative =9325&creativeASIN=B000BQSYRO&linkCode=as2&tag=aff iliatechie-20">Reflectix ST16025 Staple Tab Insulation</a><img src="http://www.assoc-amazon.com/e/ir?t=affiliatechie-20&l=as2&o=1&a=B000BQSYRO" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />
