You need a solid block above and below your door.
Half slabs count as roof.
Slabs on the roof do not affect the spawn rate at all.
That means a total savings of around 12 000.
Precast half slabs are an excellent choice for a floor structure in apartment houses villas and cottages.
So there is a 3 block vertical space do wither skeletons require an extra empty space above their heads in order to spawn.
You also saved around 1 700 square feet of shingles underlayment and roof decking which would cost about 3 100.
As nouns the difference between roof and slab is that roof is the cover at the top of a building while slab is archaic mud sludge or slab can be southern us slang a car that has been modified with equipment such as loudspeakers lights special paint hydraulics and any other accessories that add to the style of the vehicle.
Note that the inner height of spawn chamber needs to be 3 blocks or higher in order to trigger this bug.
1 side needs a roof and the outside has to be empty or trans block to register as a house.
But now that im putting a roof on it made out of half slabs ofcourse the spawn rate has decreased dramatically.
Every house needs a roof and a slab.
Light level is well below 7.
I know wither skeletons are 3 blocks high so i placed the ceiling at block 4.
Half slabs are a transparent block like stain glass and glowstone.
As verbs the difference between roof and slab.
Now it takes several tens of minutes to spawn even a single mob.
You just saved 1 450 square feet of slab which is roughly 9 000 at today s price.
Observe that the spawn rate has severely reduced.