Effective June 1, 2016 new HUD regulations require that the area around the perimeter of the home (abutting the foundation) must be properly finished and back filled to allow for proper drainage away from the perimeter of the home and foundation. A home site which is not properly finished and back filled can result in the failure of the final HUD inspection. Final site finish is not provided directly by Magnum Development (typically completed by an excavation or dirt contractor. For example, whoever did the initial site preparation for your home). We are happy to assist the homeowner to complete this final step in the HUD inspection process if needed. Please call our office at 406-628-3019.


Finished home sites

prepared home sites

VAPOR BARRIERS

Vapor barriers are required on all new manufactured home sets as of June 1, 2016 PER HUD 3285.

All vapor barriers must be pulled out past the perimeter of the home. 

Remove All Organic Material​

(Horizontal Perimeter Insulation) 

LOCAL PERMITS

If you live in a city or town make sure to obtain all local permits and follow all local codes and requirements for that city.

site preparation

In order for us to make absolutely sure that we bring the correct amount of materials and tools to the job site - if you've already purchased the Magnum All-Steel Skirt Wall or a Frost Protected Shallow Foundation - please print and fill the House Measurements Worksheet out. We want to make sure that we complete your installation with the proper materials and in a timely manner!​

406-628-3019

220 W Main St Laurel MT 59044 US

It's always nice to see an example! Below are pictures of the final site finish and back fill:

Proper site finish and back fill includes just a few easy steps that will ensure your home is in compliance with HUD 3285 and ASCE 32.01 requirements. Below are instructions to complete the final site finish and back fill for those DIYers who choose to do it themselves!


A 12 inch minimum depth is required for final back fill requirements. 


To maintain proper drainage to divert water away from the home back fill must slope away from the house at 1/2 inch per foot for 10 feet. DO NOT push dirt/gravel against the skirt wall. Dump dirt/gravel at the perimeter of the skirt wall and pull it back away from the wall at a slope of 1/2 per foot for the required 10 foot minimum.

Please keep in mind that these home sites are considered new construction and have not yet been landscaped!

Final site finish and back fill

Sometimes it's easier to see an example! Below are a few homes with prepared sites:

​Click below to view our House Measurements Worksheet

Just a heads up!


As of June 1, 2016 - HUD 3285 requires back fill on ALL Frost Protected Shallow Foundations. Required perimeter back fill is 12" - 14" sloped for drainage AWAY from the perimeter of the home. 


Back fill is the responsibility of the homeowner but we are always happy to provide you with additional information - so give us a call!​​

Final site finish and back fill should be completed with the same material that is acceptable for the initial site preparation of the sandy gravel base pad built for your home.


Some examples of proper sandy gravel material would be:


- Three Quarter Minus

- Half Minus

- Sandy Road Base 


Horizontal perimeter insulation (if required by home location) must be covered completely for proper site finish and back fill. 




LEVELING ASSIST DEVICES

Even though your home site may look level to the naked eye it might not actually be! There are a variety of leveling devices available (i.e. laser levels) to assist in making sure your site is truly level. Most rental equipment stores have these available!

Proper site preparation includes just a few easy steps and will ensure that your new manufactured home is not only ready for proper set, foundation anchoring and perimeter wall enclosure but will provide many years of trouble free living with greatly reduced ground shifting/settling, wall and ceiling cracking, etc..


We truly care about your home! That's why Magnum requires a properly prepared site for the installation of our engineered HUD/FHA permanent foundation anchoring systems as well as the Magnum All-Steel Skirt Wall. Not only is site preparation a requirement for HUD it also optimizes the performance of your Frost Protected Shallow Foundation.

PREPARING YOUR HOME SITE

You should ALWAYS make sure to check with your home dealer and the installation manual for your home to make sure that you have prepared your site properly. 

We can provide you with general information on how to prepare your home site but, we always want to make sure that you have prepared your site exactly as the installation manual for your brand of home intended.

The installation manual for your home will provide you with a detailed list of instructions on proper drainage under your home and proper crowning of the site PER the manufacturer. 

If your home hasn't arrived yet you'll want to make sure you lay the ground work for a great foundation. 


Begin by scraping/removing all organic material away from where the home will be set. Organic material can include materials such as wood, grass, twigs, large rocks, brush and tree stumps. 


If you have an existing home that will be receiving the Magnum All-Steel Skirt Wall as part of a Frost Protected Shallow Foundation or as standalone skirting, make sure to:


- Remove ALL existing skirting, nails and staples from the sill joist of the home (that's the board that goes around the perimeter of the home just behind the bottom of your siding). 

- Make sure that the dirt/gravel at the perimeter of the home is flat and level and no large clumps or rocks remain in the pathway of the wall.

- Make sure to pull any temporary steps away from the perimeter of the home to provide a clear pathway for installation.

- Clearly mark any shallow lines or pipes extending past the perimeter of the home to keep our contractors safe! 


flat and level


One of the most important requirements! Once you have scraped the site it should be properly graded and leveled to provide a FLAT AND LEVEL site for placement of the home. Flat and level means within 1" - 2" elevation from all sides. The site should be leveled so that the total of prepared ground is 8 feet larger than the footprint of the home (i.e. 4 feet of flat and level ground should extend out on each side/end of the home). The larger pad will make allowances for slight alterations in exact placement of the home as well as providing room for the crews to work. 


Sandy Gravel base pad


Once the site is prepared and "flat and level" a 4" to 6" sandy gravel base pad should be placed over the entire "flat and level" site. 


Some examples of proper sandy gravel material would be:


- Three Quarter Minus

- Half Minus

- Sandy Road Base


PLEASE DO NOT use any mix that has aggregate larger then 3/4"! 

NO large screened gravel (graded/screened gravel larger than 3/4" without the "fines" or sandy material).

NO "Pit Run" (which includes large rocks and sometimes even small boulders!


compaction


Once the sandy gravel base is in place on your flat and level site the entire pad should be re-checked for "level" and smoothed, if needed (to "flat and level"). The pad should then be rolled or compacted to a recommended 1,000 psf or greater. 


Always check with your home dealer AND the home installation manual to make sure you have crowned the home site for proper drainage away from the home.