Contained foam envelope for insulating and sealing large volumes

A method for sealing or insulating a large volume comprising:

• placing an envelope within the large volume against at least one substrate;
• the envelope having walls defining an interior, and an exterior fitment in one wall, the fitment being in fluid communication with the interior of the envelope and being dimensioned to sealingly engage the outlet of a delivery device for connecting to a source of components of a foaming composition and delivering the foaming composition to the interior of the envelope through the fitment;
• and a matrix disposed in the envelope interior adjacent to the fitment to mix components of a foaming composition,
• delivering a quantity of components of the foaming composition to the interior of the envelope through a delivery device connected to the source of components of the foaming composition and to the exterior fitment,
• whereby the components are mixed within the matrix to initiate a foaming reaction within the envelope.

A method for sealing or insulating a large volume using an envelope system, the envelope system comprising a plurality of envelopes each having walls defining an interior and an exterior fitment in fluid communication with the interior;

• the fitment being adapted to receive a delivery device for delivering components of a foaming composition to the interior of the envelope;
• each envelope being joined to at least one other envelope along a common side, the common side having a series of perforations for separating one envelope from the other
• the method comprising:
• separating a portion of the plurality of envelopes as needed to create a modified envelope system to fit an irregular volume;
• placing the modified envelope system within the large volume against at least one substrate;
• delivering to the interior of the envelope through the delivery device connected to the source of components of a foaming composition and to the exterior fitment a quantity of components of the foaming composition mixed to initiate a foaming reaction within the envelope.