This will show you how to build a DIY mold containment for homeowners and contractors alike.  A lot of what we are going to say is simply intuitive and logical.  Understand that the “idea” is that you want to keep the mold spores from being distributed while you are removing them from the work area.

How to build a DIY mold containment

Here is what you will need:

Painters (blue or non marring) tape preferably 2″ wide.  Duct tape, or better Gorilla tape.  Staple gun.  6 mil clear plastic.  HEPA rated filter (any size is fine but minimum 12 x 18) I recommend a Filterete model ultra allergen 1500A N95 rated mask (preferably with a vent).  A zip wall tape zipper for building barriers.  A Tyvek suit, gloves & heavy duty contractor trash bags.  Box cutter.  Step ladder


a zip wall pole set (expensive for a one time use) and not necessary.  Some sort of fan/filter causing air to be “drawn out” of the “contained area” to promote negative air pressure.  You can easily build one by reading our article on this here.

This is the tape/zipper that is applied to the outside of the contained area to provide secure access.  This zipper is placed on the outside of the entrance and taped onto the plastic.  Then the zipper is opened and the slit is cut.

There are video’s on the the web that show how to install a zipper.  Adjacent to the zipper in the plastic wall the “filterete filter should be cut into the plastic wall (careful to make the direction such that the air is allowed to flow INTO the containment).   After the filter is cut into the side of the wall, it should be taped with Gorilla tape on all sides to create a seal.

The images here show “zip wall” extension poles used to support the plastic onto the ceiling.  This isn’t necessary, however they are useful.  Simply first take a small piece of Gorilla tape and tape the plastic to the ceiling on one end.  Then with the staple gun tack the Gorilla tape to the ceiling and plastic.  Then go along the ceiling area and repeat this approximately every 3 lineal feet or so.  Then with your 2″ blue tape, make an air tight seal with the plastic and the ceiling, taping all along the top portions.

How to build a DIY mold containment

First off remove all personal belongings from the work space.  When you select the work space make sure that you have chosen enough room to work in and encompass the work to be performed.  Good rule of thumb, is to make it bigger than you think and use common areas of entry and exit as the exterior barrier of the work space area.  e.g. the entry door.  Decide where your entry and exit to the work space containment area will be.  It is best if you can to use a door.  Try to be sure that you have a window in the room to the outside if possible. IF you do NOT have a window in your work space it is ok, but you may want to think about venting via some 8″ air conditioning duct to the outside.  If you do this then you will have to cut into your containment area and tape around that and run it outside.  Again much easier to simply have a window.

Tape an air tight seal on the ceiling and on the flooring where the plastic meets the ground.  Depending upon the surface you are working on (carpeting, concrete, tile etc.) make sure you protect the flooring from both work damage as well as mold spores.  It is very hard to remove mold spores from carpet.  however, do NOT exacerbate this getting more mold spores on your carpet.  So remove  your carpet and padding prior to the work if applicable.

Negative pressure why?

ok so you want to try to maintain negative air pressure inside of the containment room area.  This is so that when anything (mold spores, lead paint, dust, respirable particulates) that are disbursed into the air are captured and/or dispersed outdoors.  So, to do this the best way is to build yourself a HEPA filter and place that into the window inside of your containment.  First tape off the window with plastic with the window opened.  Then cut and tape the filter into the window directing the air flow OUT of the room.  Keep this filter running and this will maintain negative pressure.

Anyhow, if you have followed these instructions you should have a negative pressure containment area with flow through ventilation allowing fresh make up air to enter the room.  If you get stuck, you can always reach out to us and we will be glad to help

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