Ulmus Americana (Soft elm)


Add to Favourite

Use the following links to jump to the associated section in the main data.

Scientific Name
Ulmus americana

Trade Name
Soft elm

Family Name

Common Names
American elm, Elm, Florida elm, Soft elm, Swamp elm, Water elm, White elm

Regions of Distribution
North America

Countries of Distribution  [VIEW MAP]
Canada, United States

Common Uses
Baskets, Boxes and crates, Building materials, Casks, Cooperages, Decorative plywood, Decorative veneer, Farm vehicles, Figured veneer, Food containers, Interior construction, Interior trim, Machinery parts, Millwork, Moldings, Packing cases, Pallets, Plywood, Skids, Trimming, Vehicle parts, Veneer, Wainscotting, Wheels

Environmental Profile

Abundant/Secure
Some long-term concern for the species
May be rare in some parts of its range
Extinct, Endangered, Vulnerable, or Rare within its range
Considered vulnerable in its natural habitat because its numbers are threatened by serious adverse factors throughout its range. However, the species likely exists today in relatively large numbers.

Distribution Overview
The growth range of American elm extends from southeastern Saskatchewan east to Cape Breton Island, south to central Florida, and west to central Texas. It is also widely planted in western United States, beyond its native eastern range. reported to grow in mixed hardwood forests, and prefers moist soils, particularly in valleys and flood plains.

Heartwood Color

Brown
Red
Reddish brown
Light brown
Golden brown with a reddish cast
Brown

Sapwood Color

Red
Brown
Grey
Brownish white

Grain

Even
Interlocked
Straight

 

Straight
Occasionally interlocked, but not always

Texture

Fine
Medium
Woolly
Coarse

Natural Durability

Perishable
Non-durable
Durable
Very little natural resistance

Susceptible to attack by wood borers, and Dutch elm disease

Odor

Has an odor
No specific smell or taste

Kiln Schedules

T6 – D4 (4/4) US
T5 – D3 (8/4)US

Drying Defects

Checking
Distortion
Warping can be expected
Ring failure

Ease of Drying

Thick Stock Requires Care
Medium to High Shrinkage
Moderately Difficult to Difficult
Little degrade
Requires slow and careful seasoning to prevent degrade.

Tree Size

Tree height is 10-20 m
Tree height is 20-30 m

Product Sources
The Lake States in the United States are reported to have the best Elm stands, but the species is also distributed throughout the eastern part of the country. The timber is readily available from commercial dealers, and is priced in the moderate range.

Certified Source

Certified Source

Substitutes
Keyaki (Zelkova serrata)

Blunting Effect

Moderate
Blunting effect on machining is moderate

Cutting Resistance

Fairly Difficult to Very Difficult to saw

Cutting resistance is rather small if edges are kept sharp. Sawn surfaces are often woolly

Gluing

Fair to Good Results
Fairly Easy to Very Easy
Good properties

Movement in Service

Fair to Good Stability – Medium Movement
Moderate dimensional stability after seasoning
Medium

Nailing

Fair to Good Results
Fairly Easy to Very Easy
Good nailing properties

Planing

Fair to Good Results
Fairly Difficult to Very Difficult
Woolly

Reported to respond to sharp and thin cutting edges to produce a clean and smooth finish

Resistance to Impregnation

Resistant heartwood
Resistant sapwood
Sapwood is permeable
Heartwood is moderately resistant

Response to Hand Tools

Fairly Difficult to Difficult to Work
Good
Cutting edges should be kept sharp to prevent torn rays

Screwing

Fair to Good Results
Fairly Easy to Very Easy
Good screwing properties

Steam Bending

Very Good to Excellent Results
Fairly Easy to Very Easy

The wood has good steam bending properties

Polishing

High finish

Staining

Fair to Good Results
Fairly Easy to Very Easy
Very Good to Excellent Results
Stains well

Varnishing

Fair to Good Results
Fairly Easy to Very Easy

Strength Properties

Max. crushing strength = low
Bending strength (MOR) = high

Can be used as a substitute for rock elm

Numerical Data

Item Green Dry English
Bending Strength 7056 11662 psi
Crushing Strength 431 769 psi
Hardness 813 lbs
Impact Strength 49 49 inches
Maximum Crushing Strength 2876 5370 psi
Shearing Strength 1480 psi
Static Bending 3332 5880 psi
Stiffness 1093 1401 1000 psi
Work to Maximum Load 14 16 inch-lbs/in3
Specific Gravity 0.48 0.54
Weight 55 35 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 8 %
Volumetric Shrinkage 15 %
Item Green Dry Metric
Bending Strength 496 819 kg/cm2
Crushing Strength 30 54 kg/cm2
Hardness 368 kg
Impact Strength 124 124 cm
Maximum Crushing Strength 202 377 kg/cm2
Shearing Strength 104 kg/cm2
Static Bending 234 413 kg/cm2
Stiffness 76 98 1000 kg/cm2
Work to Maximum Load 0.98 1.12 cm-kg/cm3
Specific Gravity 0.48 0.54
Weight 881 560 kg/m3
Radial Shrinkage 4 %
Tangential Shrinkage 8 %

References
Boone, R.S., C.J. Kozlik, P.J. Bois and E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. United States Department of Agriculture, Forest Service, Forest Products Laboratory, General Technical Report FPL-GTR-57, Madison, Wisconsin.

California Department of Forestry. Comparative Physical & Mechanical Properties of Western & Eastern Hardwoods. Prepared by Forest Products Laboratory, University of California at Berkeley, Berkeley, California. n/d.

Canadian Forestry Service. 1981. Canadian Woods – Their Properties and Uses. Third Edition. E.J. Mullins and T.S. McKnight, Editors. Published by University of Toronto Press, Toronto, Canada.

HMSO, 1981. Handbook of Hardwoods, 2nd Edition. Revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.

Jackson, A. and D. Day. 1991. Good Wood Handbook – The Woodworker’s Guide to Identifying, Selecting and Using the Right Wood. Betterway Publications, Cincinnati, Ohio.

Jackson, A. and D. Day. 1991. Good Wood Handbook – The Woodworker’s Guide to Identifying, Selecting and Using the Right Wood. HarperCollins Publishers, London.

Kaiser, J. 1989. Wood of the Month – Elm: An American Favorite Suffers from an Imported Disease. Wood of the Month Annual, Volume 1, Supplement to Wood and Wood Products. Pg. 31-32.

Kline, M. 1985. Ulmus americana – American elm. In A Guide to Useful Woods of the World. Flynn Jr., J.H., Editor. King Philip Publishing Co., Portland, Maine. 1994. Page 355-356.

Lincoln, W.A. World Woods in Color. Linden Publishing Co. Inc, Fresno, California.

Little, E.L. 1980. The Audobon Society Field Guide to North American Trees – Western Region. Published by Arthur A. Knopf, New York.

Panshin, A.J. and C. deZeeuw. 1980. Textbook of Wood Technology, 4th Edition. McGraw-Hill Series in Forest Resources. McGraw-Hill Book Company, New York.

Rendle, B.J. Editor. 1969. World Timbers, Volume Two – North & South America (Including Central America and the West Indies). Published by Ernest Benn Limited, Bouverie House, Fleet Street, London.

USDA. 1987. Wood Handbook – Wood as an Engineering Material, Forest Service, Agriculture Handbook No. 72, Forest Products Laboratory, Madison, Wisconsin.

USDA. 1988. Dry Kiln Operators Manual, Preliminary Copy. Forest Service, Forest Products Laboratory, Madison, Wisconsin.