Description
Ultra/R® is a rigid, non-structural polyisocyanurate foam insulation board with protective facers of foil laminate on both sides. It is available in
many thicknesses, sizes and R-values to meet particular insulation requirements. Contains no CFC's. Also available with kraft facer one
side (Ultra/kraft) for applications requiring a nonreflective facer.
SIZES and THERMAL RESISTANCES
Nominal Thickness |
1/2" |
5/8" |
3/4" |
1.0" |
1.5" |
2.0" |
3.0" |
R-value (aged) |
3.6 |
4.5 |
5.4 |
7.2 |
10.8 |
14.4 |
21.6 |
4' x 8'
panel / unit |
84 |
68 |
56 |
42 |
30 |
23 |
15 |
Uses
Ultra/R® Insulating Sheathing is for use in residential or commercial construction with wood or metal framing to provide additional insulation for
the following exterior sidings. Brick or wood, hardboard aluminum and vinyl sidings which are fastened to the wood or metal frame through the
sheathing. Where building codes require a 15-minute thermal barrier, apply 1/2" gypsum wallboard to sidewall interiors. Combining 3/4" thick
Ultra/R® in conventional 2 x 4 sidewall framing, 3-1/2" fiberglass and finish siding provides an insulated wall system in excess of R/19.
PHYSICAL PROPERTIES OF ULTRA/R®
Nominal Foam Core Density |
ASTM D-162 |
2lbs. /cu.ft (Avg.) |
Compressive Strength (Min.) |
ASTM D-1621 |
16 lbs./sq. in. |
Moisture Vapor Transmission |
ASTM C-355 |
1.0 perm inch |
TYPICAL WALL SECTION |
Outside air film = |
0.17 |
5/8" wood siding = |
0.84 |
3/4" Ultra/R®= |
5.40 |
R/13 fiberglass = |
12.68 |
1/2" gypsum = |
0.45 |
Inside air film = |
0.68 |
|
Total wall section R-value = |
20.22 |
Code Compliances
Conforms to:
ICBO-Uniform Building Code: sect. 1712 (a) and (b).
BOCA-Research Report #91-53
SBCC-Report 8653
CABO-Sect. R-217
Fed. Spec. HH-I-1972/1
FM Listing
Factory Mutual Research Corporation Specification tested per ASTM E-84 (84a) test method FM Reports J.I. OX1 Q6.AM and
J.I. OW6Q7.AM Homasote CompanyUltra/R® foil faced polyisocyanurate foam insulation sheathing board tested with foil facing removed. 1.8
pcf (31.5 Kg/M3) density,
FIRE TEST RESULTS
Ultra/R |
Flame Spread |
Smoke Density |
1/2 in. thick* (12.7 mm) |
20 |
40 |
4 in. thick (101.6 mm) |
25 |
250 |
These numerical values are rounded to the nearest five and not intended to reflect hazards presented by this material under actual fire
conditions. Faculty mutual audit inspection and re-examination program relates only to the above.
*The 1/2 in. (12.7 mm) specimen was supported using 1/4 in. steel rods and 2 in. galvanized hexagonal wire per ASTM E-84 standard
mounting methods.
WARNING - Polyisocyanurate (an organic material) will decompose above 450°F and will ignite and burn at 600°F to 700°F or when
exposed to open flame. Therefore, Ultra/R® should not be used in exposed applications. |
"R" means resistance to heat flow. The higher the "R" the greater the insulating value. To get the marked "R" value, it is essential that this
insulation be installed properly. Follow the instructions carefully. |
General Construction Data
To get the rated R-value, it is essential that Ultra/R® insulating sheathing be protected on site from inclement weather by storing indoors or on
a dry platform under shelter. Keep wrapped in packaging until ready for use. If no shelter is available, stack panels on skids 8" above grade
and cover with polyfilm or other device. Panels must be installed in a dry condition only.
Ultra/R® Sheathing Over Framing
(A) Install an acceptable corner brace system using bracing of either metal strapping or let in wood.
(B) Install Ultra/R® panels vertically with long edges in light contact with adjacent panel. Ensure solid backing on all four edges. Nail with
galvanized roofing nails (3/8" heads) of sufficient length to penetrate framing a minimum of 3/4". Nail 8" o.c. around all edges and 12" o.c.
through the field.
(C) Use a utility knife and straight-edge to cut Ultra/R® to fit irregular wall angles or projections.
(D) Apply finish siding in accordance with siding manufacturers recommendation for proper installation.
NOTE - Install a 4 or 6 mil polyethylene vapor barrier according to local building codes or as climate conditions warrant, on the interior wall
framing under 1/2" gypsum wallboard.
Ultra/R® Sheathing as Gypsum Underlayment
(A) Follow steps B, C above.
(B) Seal all interior sheathing joints and penetrations with aluminized tape to maintain optimum vapor barrier effectiveness of the wall system.
(C) Apply a minimum 1/2" thick gypsum wallboard over the installed and sealed Ultra/R.® Stagger joints, nailing 8" o.c. on all studs, top and
bottom plates.
Ultra/R® Sheathing as Interior Masonry Wall Insulation
(A) Install Ultra/R® to the masonry wall and apply furring strips over Ultra/R® spacing a maximum of 24" o.c., fastening through to the masonry
wall.
(B) Follow steps B&C of Ultra/R® Sheathing as Gypsum Underlayment.
Ultra/R® Sheathing as Cavity Wall Insulation
Install Ultra/R® in 16" or 24" widths between wall ties and attach with masonry fasteners to masonry wall.
Ultra/R® Sheathing as Concrete Slab Insulation
Install a minimum 4 mil polyethylene vapor barrier over level, dry compacted fill. Place Ultra/R® over vapor barrier below reinforcement steel
and then pour concrete slab.
availability
Homasote building products are available throughout the United States and Canada from local building material dealers.
