Final insulation install inside our Expedition truck habitat. All DIY !

[@-joe90]

Kältebrückekiller 👍🏻

[@RichardCrabbe403]

Looking great! Should be cold bridge free and definitely limit the potential for condensation. Nice work my friend!

[@oscaroverlander_MB1222AF]

Thank you ! I think so too .

[@livingworkingoutsidebox]

Watching you do these videos, helps to build or mold my mindset that I could follow this series and with ton more practice build my Expedition truck. 🛠👍 Then doubt creeps in.😮 So need to keep building these skills and rewatch these videos to tell my self it's OK to have doubt as long as I like you keep taking action. Thanks again

[@oscaroverlander_MB1222AF]

Developing the needed skills is just a matter of practice and known as " where is a will there is a way " ! Important is to understand what commitment such a project is, how time and money consuming it is. You wont believe how much time I spend on the computer to find material, solutions and the right method for my project. Having doubts is actually good as long you ( you said it ) take action ! Solving one thing after an other gives you self confidence and makes you even more proud of you project !

[@livingworkingoutsidebox]

@@oscaroverlander_MB1222AF Very true. I have adjusted my budget several times. Not to mention the time to build it. Now that I'm 90% certain, a Mercedes 917 truck will fit the bill, I know it will cost around $30k to get it door to door. It should be $25k but I put little padding in. The big thing is do I just modify the current box, diy a framed habitat like yours, or buy a composite diy like Globe Trekker. Thanks for sharing your journey and build it's extremely helpful. 👍🛠

[@oscaroverlander_MB1222AF]

@@livingworkingoutsidebox A 917 MB is an excellent choice although you need to monitor your overall weight a little because it is only a 9 ton overall weight chassis. An existing firefighter box is sometimes used as camper but it is limited in the offroad capability because of the different build subframe ( not made for this purpose ). If the 917 is your final choice I would consider a composite box because of the weight savings, a composite habitat empty is probably 30 % lighter than my build. But I have a 12 ton chassis.

[@livingworkingoutsidebox]

@@oscaroverlander_MB1222AF Yes I was concerned about the weight. This one is looking like a Surfer's dream Airbnb. With a pop top roof for stationary head room. Closed, like the Dakar Desert Rally trucks. Trying to blend concepts and budget. Yes no subframe worries me but 95% of the time it's just driving down the regular roads. But would sell it down the road to build a "real" Expedition truck. Still working things out.

[@SB-nr1dz]

Nicely done, thanks again for sharing your work. I'm still working on bringing a truck into Canada, any information on how to get it off a ship and legally onto Canadian roads would be very helpful if you have some time.

[@oscaroverlander_MB1222AF]

Thank you and all the best for your truck hunt ! I can definitely make a video how to import and legalize a truck on the road but right now I am really pressed for time. Got a lot of things going on at the moment. What is you time horizon for the import ?

[@SB-nr1dz]

@@oscaroverlander_MB1222AF my plan is for it to arrive before winter but we will see, I am quite picky about which chassis is ideal for me! Spend your time on your build, I really enjoy watching your progress.

[@fujiwaratofushop]

I am just about to start sticking my insulation sheets in and curious how many cans of spray foam you used for both layers, my box is similar size. Thanks!

[@oscaroverlander_MB1222AF]

Hi nice to hear from someone who has his own project ! I have used a full box of the akfix plus 3 cans for both layers and the plywood install. Good luck with the project and if you have pictures on social media post a link here !

[@fujiwaratofushop]

Thanks mate! your videos have helped me more than you would know. My construction is very similar to your box, steel frame but I used ACM sheets instead of alloy.I also have made my roof slide up on linear actuators to keep the box hight down, important on australian tracks. So did you use the akfix to stick the ply sheets inside as well? I was able to finally find a supplier for akfix in australia and will start sticking my foam as soon as it arrives. @@oscaroverlander_MB1222AF

[@chrisdaniel1339]

Were you aware that polyisocyanurate insulation loses R-value in relationship with decreasing temperature? The following text is from the Owens Corning website: "Polyiso: At a mean temperature of 75°F, the polyiso sample also exhibits a level of thermal conductivity which correlates to its published R-value of R6. 0/inch. However, as the mean temperature drops to 15°F, the R-value decreases to approximately R2. 0, representing a significant 66% loss in R-value." What this means is the even though on the surface it appears polyisocyanurate has a higher R value and it does in warm temperatures, it has the same or lower R value compared to XPS when you actually need it the most in cold weather conditions. Extruded Polystyrene (XPS) closed cell ridged foam board is a better option for insulation for cold weather climates as there is no reduction in R value as temperature decreases.

[@Rhino_Overland]

True enough but XPS also has a global warming potential (GWP) that is 1430 times worse than carbon... The other options are EPS or the likes of Roxul. But I think it's a little late now for Oscar ;) I think once the heater is on and with all the plywood on top it will still keep him toasty even at sub freezing temperatures. As always, great work and attention to details Oscar!

[@oscaroverlander_MB1222AF]

No, I'm not, but I have trouble taking a single opinion from a company as representative. Thanks for bringing this to my attention, if you don't mind could you post the link from the laboratory test specs, they must have tested it if they come to such conclusion.

[@chrisdaniel1339]

@@oscaroverlander_MB1222AF This article linked below is from Oak Ridge National Laboratory (a government run laboratory) here in the US. The inverse relationship between thermal resistance (R-value) to temperature is well documented. I you Google search "polyisocyanurate R value decreases with temperature decrease" you will get a plethora of results attesting to the fact. What happens is the blowing agent that is used is a gas at higher temperatures and when temperatures drop the blowing agent condenses inside all the trillions of air pockets in the insulation reducing its R value degrading its insulation properties www.osti.gov/servlets/purl/1807253