Panel construction

An internally spaced supported vacuum panel comprising:

• a pair of substantially parallel facing panel sheets having edges, a plurality of internal spacers for said panel sheets, said internal spacers including a continuous undulating wave form rigidized vertical metal ribbon with a top and a bottom having at least two strips of interrupted slits running parallel the top and the bottom of said vertical metal ribbon, undulating rows formed by the interrupted slits lying one above another in a contoured wave form so that each adjacent row produces a wave form of opposite contour to another adjacent row, said internal spacers being spaced apart, placed inbetween and connected to said panel sheets;
• and peripheral vertical support spacer members connecting the substantially parallel facing sheets providing an airtight seal to provide a vacuum, whereby when said panel is placed in the vacuum the panel is rigidified and an insulation effect is created in proportion to a degree of vacuum provided, and the slit configuration with the opposing contoured rows being forced together in firm support position with respect to the panels, said vacuum causing the panel sheets to compress the internal spacers and bring the opposite contour wave form of adjacent rows into play as further support.