The following are the Grumpy's instructions, it doesn't mention IBU's here but elsewhere I have read 40-45IBU.
Hope this helps you out.
Hopefully I am not breaching any kind of copyright, if someone tells me I am I will remove this post.
Cheers
Nige
500g Flaked Barley
500g Roast Barley
1000g Pale Malted Barley
1.5kg Light Malt Extract
Hops - Target and Challenger
Wyeast 1084 Liquid Irish Stout Yeast from Guinness
Grumpy\'s Real Irish Stout
Instructions
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Stage 1: The Mash
Place the crushed grain in a large saucepan (at least 9L), cover with water and bring to 66 degrees C. Keep stirring until you are sure that there are no dry pockets in the grain. Once 66 degrees C has been reached, turn off the flame or hot plate. Check temperature after 20 minutes, if it has dropped, turn hotplate on to low and whilst stirring gradually increase the temp. to return to 66 degrees C.
The idea is to get a full hour at 66 degrees C.
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Stage 2: The Sparge
Note: This should be commenced at the last stage of the mash above.
Drain the mash in a colander or pasta sieve, this should take about 5-10 minutes.
When mash is dry, add mash back to pot, add 6-7 litres of 70-80degC water, stir and drain for the last time.
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Stage 3: The Boil
Following the sparging exercise, you should now have about 5 to 7 litres of WORT which you now bring to the boil. Once up to the boil, add hops and continue boiling for 30 minutes. Remove from heat, cover and place pot and all into a sink full of cold water for 10 minutes to cool down. Replace water in sink and repeat step 2.
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Stage 4: Prepare the fermentation
Pour the wort into your fermenter and add the tin of malt extract.Fill to 20 - 23 L with cold water. Add dry Hops. Pitch yeast once below 26 Degrees C. Screw on the lid of your fermenter, fit the airlock and allow to ferment as usual.