Revision as of 08:56, 11 April 2021

Doors are expensive. A simple way to build them would be to get foam insulation, and cover it in 20 gauge steel.

Foam is $2/3 /sf [1]
20 ga sheet [2] is about $108 [wiki.opensourceecology.org/wiki/Seed_Home_Interest_Form] for 36"x168" of steel. 24 ga is $74.
3D print a nice cover face for the door.
Fire proof is 16 ga [3]

Cost Analysis

3D printed + steel doors get us to about $100 in materials cost with 20 ga. 1/3 - 1/6 the cost of industry standards.
90 minute rated start at $350 at 24 ga. [4]. Fire proof (90 minute) starts at around $600 [5].

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 =Cost Analysis=
-*3D printed + steel doors get us to about $100 in materials cost with 20 ga. 1/3 of industry standards.
+*3D printed + steel doors get us to about $100 in materials cost with 20 ga. 1/3 - 1/6 the cost of industry standards.
 *90 minute rated start at $350 at 24 ga. [https://www.menards.com/main/doors-windows-millwork/exterior-doors/front-doors/mastercraft-reg-90-minute-primed-steel-6-panel-adjustable-steel-frame-fire-door-system/4141392/p-1444448363761.htm]. Fire proof (90 minute) starts at around $600 [https://www.homedepot.com/p/L-I-F-Industries-36-in-x-80-in-Gray-Flush-Exit-Left-Hand-Fire-Proof-Steel-Prehung-Commercial-Door-with-Welded-Frame-UWX3680L/202510508?source=shoppingads&locale=en-US&mtc=Shopping-B-F_Brand-G-Multi-NA-Multi-NA-Feed-PLA-NA-NA-Catchall_PLA&cm_mmc=Shopping-B-F_Brand-G-Multi-NA-Multi-NA-Feed-PLA-NA-NA-Catchall_PLA-71700000014585962-58700001236285396-92700010802552505&gclid=CjwKCAjwvMqDBhB8EiwA2iSmPBxbGZdd_xKz9IBwXwDdhuGLslQOfGJt-JIMeqjfc11Cz5pTKI3wnhoCs1QQAvD_BwE&gclsrc=aw.ds].