We do a DIY garage door insulation using RTech 8'x4', 1inch thick foam board (R3.85) with radiant barrier plus we add some bubble wrap barrier to increase the Rvalue and provide more radiant barrier on inside. This option is about the same cost as the white foam kits sold at Lowes or Home Depot. If you don't do the bubble wrap, it will be half the price. The foam kits are 1/4inch thicker (R4.8) but DOESN'T have a radiant barrier. Though radiant barrier doesn't add "Rvalue" it does add to the effective insulation and reduction in heat gain.

Each single car section needs two (8'x4') foam boards. So I used 6 for three car garage. I used two rolls of the Double reflective bubble radiant barrier, with 10ft left over. This combo is much cheaper than the kits for both the foam and the precut Reach Barrier.

RTech R3.85 Insulating Sheathing (~$15/each) https://homedepot.sjv.io/BXAYkq
48 in. x 25 ft. Double Reflective Insulation (~$45/ea) homedepot.sjv.io/yRLxxW

Other more expensive "Garage Insulation Kits", I don't recommend since its more cost for same results (less some cutting).
Reach Barrier (1 kit per car size door) https://amzn.to/36Ax8u6
Foam Garage Door Insulation Kit (8Pieces) homedepot.sjv.io/BXAYYq

Support the Patreon:   / tunerwithkids  
Merch Available: https://teespring.com/stores/tunerwi...
Follow Me on IG:   / tuner_with_kids  
For questions and inquiries: [email protected]

#garagedoorinsulation #garageinsulationkit #RtechInsulation

Disclaimer: "Tuner with Kids", the alias for the human content creator for this YouTube channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any elses, vehicle/property whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “asis" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle/property. Please note that some of the links provided are affiliate links and I may earn a commission if you purchase through the links. I use all of the products shown and recommend them because they are from companies I have found to be helpful and trustworthy. Please let me know via email if you have questions regarding any of the products/tools used.