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Question:

what is the best type of foam used for lost foam casting?

i have been trying to do my first couple lost foam castings and i am using the pink housing insulationi don't know if it is because of how dense the foam is or if i do not have the temp up high enough on the aluminum but it never takes the full shape of the moldany tips or suggestions would be greatly appreciated.

Answer:

Personally I would probably tear up the floor and put down fiberglass battsThe cellulose will settle eventually and you will lose your insulation value with no way to fix itPlus, there is the light fixture issue and that I don't think blown in is really meant for horizontal cavities.
you'd have to figure out where all the fixtures areand build boxes arounf them unless they're ated for contacht with Insulation yuo'd also want to keep the insulation from direct contact with the chimney as well.
Lost Foam Casting Aluminum

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