freezer constructiona question

[gands111]

Has any one ever built a wood frame freezer. For example 2x8 studs filled with friction fit. 1" foam on interior of stud with a good vapor barrier and a MDo painted plywood for the interior finish. Just curious what problems etc. might be incountered??

[chemi-cool]

Polyurethane insulated panels, 150mm thick,
the same insulation + 12cm concrete on the floor.
Same thickness insulated door with heater around it.

[coolhibby1875]

would not recommend it from a h@s point of veiw, if there was to be a fire that would go up in seconds, new moderen insulated panels take some amout of heat before they go up in flames, done a h@s course a couple of years ago, and some of the videos on coldstore fires are horific!!

[chemi-cool]

There is special Polyurethane called:Flame retardant densified polyurethane foam.

It will not burn unless the fire source is touching it, besides that there are also special paints that resist fire.

The common cause of fires is electric board, connected to the outer wall.

[tmm]

If you look at chiller/freezer construction within the small refrigerated van [less than 7.5T] they employ the method of construction which you have indicated to maximum benefit.
The principal difference centers on the internal face which as per your scheme would (a) fail to maintain a vapour barrier and (b) fail to meet environmental health requirements. This can be achieved however with the application of glass fibre and gel coat [the catalyst and gel coat typically being applied in one stage with a suitable colour pigment].
The issue with moisture forming on the door and freezing the same shut can only be avoided with low temperature heat tape.
The greater risk from fire are products of combustion. Foams are derived from oil and when they are burnt they produce carcinogenics [danger of suffocation] and if the panels which you use are old enough CFC's [which are used to blow the insulation into the mould] could be released in the form of phosgene gas.
The only 100% insurance approved product which we use is based on mineral wool and is approved via independent examination.

[gands111]

If you look at chiller/freezer construction within the small refrigerated van [less than 7.5T] they employ the method of construction which you have indicated to maximum benefit.
The principal difference centers on the internal face which as per your scheme would (a) fail to maintain a vapour barrier and (b) fail to meet environmental health requirements. This can be achieved however with the application of glass fibre and gel coat [the catalyst and gel coat typically being applied in one stage with a suitable colour pigment].
The issue with moisture forming on the door and freezing the same shut can only be avoided with low temperature heat tape.
The greater risk from fire are products of combustion. Foams are derived from oil and when they are burnt they produce carcinogenics [danger of suffocation] and if the panels which you use are old enough CFC's [which are used to blow the insulation into the mould] could be released in the form of phosgene gas.
The only 100% insurance approved product which we use is based on mineral wool and is approved via independent examination.

So the vans you are referencing they are built out of wood framing and what do you think about using FRP for the interior surface?? It seems to me a wood frame freezer well insulated with a good visqueen vapor barrier should work, Do you agree??

[tmm]

I'm showing my age now but if you look at any older coldroom that is exactly how they were constructed the reference to vans is only a current application which you can possibly inspect.
You will need to look at your loadings when you select the equipment since you will need to calculate the 'U Value' for a composite panel and use this within your overall calculations but this should not prove to much of an issue.
Many older panel were also finished in asbestos [blue/green marble effect] but for obvious reasons this should be avoided. If per chance anyone should come across the method a product is available to seal the asbestos [in paint form] which is again accepted by the environmental health since it prevents the asbestos from becoming airborne.