YeastMatch

Wyeast 1728 Scottish Ale vs Wyeast 1084 Irish Ale: which to use

Wyeast 1728 Scottish Ale: Wyeast · Wyeast 1084 Irish Ale: Wyeast

The two strains side by side on the numbers that decide it, and which to reach for.

Gauge readout
Attenuation69 to 73 % (71% typical)
Alcohol tolerance12 % tolerance
Fermentation temp13 to 24 C (55 to 75 F)
Attenuation50%75%100%
Alcohol010%20% ABV
Temperature02040 C

Published data side by side

ManufacturerWyeast 1728 Scottish Ale: Wyeast · Wyeast 1084 Irish Ale: Wyeast
Wyeast 1728 Scottish Ale temperature13 to 24 C (55 to 75 F)
Wyeast 1084 Irish Ale temperature17 to 22 C (62 to 72 F)
Wyeast 1728 Scottish Ale attenuation69 to 73 % (71% typical)
Wyeast 1084 Irish Ale attenuation71 to 75 % (73% typical)
Wyeast 1728 Scottish Ale alcohol tolerance12 % tolerance
Wyeast 1084 Irish Ale alcohol tolerance10 % tolerance
Wyeast 1728 Scottish Ale flocculationHigh
Wyeast 1084 Irish Ale flocculationMedium

Notes

Both are used for dark Scottish and Irish beers, but 1728 tolerates 12% alcohol for a wee heavy while 1084 is a softer, drier Irish stout strain.

Choose 1728 for a strong, malty Scotch ale or imperial stout.

Choose 1084 for a dry Irish stout where roasted malt should lead.

The strains in full

Sources: Wyeast 1728 Scottish Ale specification (Brewer's Friend) · Wyeast 1084 Irish Ale specification (Brewer's Friend)