GPlogo.jpg.jpg (240947 bytes)

Johnson City, TN Plant webpage

Manufacturers of Structural Insulated Panels (SIPs) and other Foam Sandwich Panels

General Panel Corp manufactures 3rd party certified, jumbo, cut-to-plan structural insulated panels (SIPs) at our Grenada, MS Plant.  For more information on full service SIPs go to (page being updated-try after 8/20/2010).

Our Johnson City, TN Plant specializes in Foam Core Sandwich Panels (also known as skins or stress skins) which are intended for timber frame enclosure and moderate span log roof construction.  Nail Base panels (foam core panels with only one OSB skin) used in insulating, non-structural situations and specialty laminated products such as OSB/GYP (osb one side, sheetrock or moisture resistant sheet rock, on the other), are also manufactured in TN.

For information about our panels used for timber frame enclosure and cathedral ceilings- TN Plant

Call for current prices on panels in Johnson City, TN 423 747-8710.  For fabricated SIPs call (866) 774-0530.

Why are SIPs Green? Green vs Greenwash

The TimberSkin option for timber frame enclosure

The Nailbase option

A timber frame alternative if timber framing breaks the budget

March, 2009 newsletter

February newsletter

Timber frame enclosure information

Post frame/SIP options

Log home uses of panels

Churches made with SIPs

Technical information on stress skins and timberskins (Johnson City, TN)

For our newsletters

Technical bulletin regarding cathedral ceiling panel installation


General information about SIPs (replacing stickframe structurally)- MS Plant

Call for current pricing on SIPs and fabrication from our Grenada, MS Plant (866) 774-0530

Using SIPs to replace conventional construction.

Technical information (Loads, spans, R-Value, etc.) on SIPs (Grenada, MS)

For our Construction manual

For Construction Details

For a collection of articles about SIPs


Sales/technical information

Johnson City, TN 37602  PO Box 5235 (423) 747-8710,  fax (423) 434-9382,  , Butch Johnson      

Union, MS 39365 PO Box 256, (866) 774-0530,  fax (601) 774-5777,  , Cathy Graham


If you would like a bid on an existing houseplan, please send your plans to our estimator in Union, MS.


Plant locations

2604 Sunset Dr, Grenada, MS

109 Perma R Rd, Johnson City, TN