This first project has been a real learning experience for us in the process of building a home. We’ve done pretty well considering we’re using a crew that has never built with SIPs, never built a green home (let alone LEED Platinum) and never built a modern style home that lacks things like soffits. We’ve remained on budget despite countless changes, but our original timeline slipped from the intended 3 months to an actual 6 months.
One thing we have learned in this process, is that simple construction documents are not enough to quickly build a “hybrid-prefab” home as we intend. As a result, I have drafted a list of theoretical documents that we hope to develop for the next project, which has already begun, and all subsequent projects. The basic idea is to eliminate any confusing at all as to what each sub is installing in the house. We need to get down to the nitty gritty details of how and exactly where everything will be installed as well. What products will we be using to flash windows and seal all air gaps. Every single detail needs to be spec’ed out. If we can accomplish this, we will greatly reduce both costs and time to build each home.
This is nothing new for larger production home builders, but for small guys like ourselves, this is relatively uncommon. The goal is to cost reduce our homes further, while delivering a higher quality product to our customers in a faster timeframe. If we can hit 10-12 weeks to build each home, we’ll be happy.
Postgreen / 100K Project Supplemental Documentation
These specs are to be supplements to the official Construction Drawings for the project to help clarify all aspects of the construction for all subcontractors involved.
- Postgreen Builder Manual – A general manual detailing all common materials, systems and methods to be employed on all Postgreen homes. Examples include how to flash all windows and how to ensure an airtight building envelope.
- Finish Spec Sheet – This list will be generated by Postgreen or a specific buyer using the new PostgreenHomes.com website. It will include things like flooring, cabinet and plumbing fixture choices for each home.
- Foundation Penetration Schematic – This document will list each item that will penetrate the slab along with the exact location of each item. This is meant to assist the plumbing and electrical subs and ensure proper fit with all future wall and casework placements.
- Roof Penetration Schematic – This document will list each item that will penetrate the roof along with the exact location of each item. The intent is to allow all roof penetrations to be made when the initial roof is installed to reduce roofing labor and dry-in the house ASAP. All permanent connections will be made at a later date and line up correctly if this plan is followed.
- Plumbing Layout – This layout will be created with the help of the Master Plumber and show exactly where all plumbing runs and connections will be made. This will ensure that there are no surprises with structural members or complicated runs that could delay the install. It will also allow the plumber to more accurately prep materials and manpower needed for the job.
- Electrical / Automation Layout – This layout will be created with the help of the Electrician and will include all details needed for the rough and finish electrical installations. This will also include any home automation, A/V or security systems spec’ed out on the home.
- HVAC Layout – All HVAC and ventilation components listed along with detailed layout of equipment and ductwork.