Task · part of 4. Build the model you chose in requirement 3

4(c). Process model: your house plumbing at 1:16

Optional May not apply Often forgotten

This may not apply to you. You have not answered "Which model are you building?" yet. Answer it and this step will either settle or drop off.

Hot and cold supply, all waste returns and venting. THE LARGEST FOOTPRINT OF THE FIVE, roughly 30 inches across for a 40 foot house, AND THE ONLY OPTION whose wording allows a scale agreed with your counselor instead.

Note. THE ONLY SCALE ON THIS BADGE YOU ARE ALLOWED TO NEGOTIATE. This option says three quarters of an inch to the foot OR an agreed upon scale, and no other option offers that. It is very likely there for a reason: the plumbing of a whole house at 1:16 is roughly thirty inches across, the largest footprint of the five by a wide margin. If two and a half feet of model is not going to work where you live, that phrase is your route out, and requirement 3 is where to use it. The requirement also names tubing, straws or printed parts as suitable materials, so this does not have to be an expensive option.

Where this step comes from

Model Design and Building Merit Badge Requirements (Merit Badge Hub, last modified 2025-12-31), Requirement 4(c) · The requirement allows the stated scale or an agreed upon scale, which no other option on this badge does.

Notes and warnings

Where this step comes from