Extract Brew - no yeasty head yet in my FV?

[SouthSide]

I did an extract brew at the weekend, Brewer's Choice IPA, added 660g of sugar and 340g of light spray malt, swapped the supplied yeast for two packs of Safeale-04, pitched this somewhat on the cool side - about 17 degrees - stirred vigorously, for an OG of 1048, so everything looked OK.

Put the lid on the FV, transferred it to an area that's about 20-21 degrees but it doesn't have any yeasty foam on the top 36 hours later, just a rather thin layer of bubbles - with more rising.

I would have expected the yeast to be climbing out of the FV and wonder if I've done anything wrong, or does it sound OK?

 

[Aleman]

Check the gravity SO4 could well have finished by now

 

[SouthSide]

Check the gravity SO4 could well have finished by now

Cheers Aleman, still very new to this, so I sterilise my hydrometer and drop it in, what gravity should I be expecting?

 

[Aleman]

If its finished it should be around 1.012 -1.014 . .. if you have had activity there will be a gungy brown ring around the FV about 1-2 inches above the wort/beer which should mean you don't need the hydrometer test. Although it is worth doing to get an idea of where it is at the moment.