How can you keep the brick from going into the baseplate in vector3?

wait(.5)

while wait() do
for i,v in pairs(script.Parent.Parent:GetChildren()) do
	if v.Name ~= "FieldTouch" then
		if v.Health.Value < 2 then
			local median = (v.Size.Y - v.Health.Value)
			v.Size = v.Size - Vector3.new(0,median,0)
			v.Position = v.Position - Vector3.new(0,median,0)
		end

	end
end
end

Its supposed to go downwards but it ends up just going through the baseplate. I just need it to stay above the baseplate but also shrink.

If you want to make the part stay in place but increase size, then it's important to know that: when you add X amount of size, the relativity for positioning it is 1/2 X. But since you want the part to go down,

read the following:

If you want the part to go down, but you don't want it to go through the baseplate, use an if statement, like so:

wait(.5)

while wait() do
	for i,v in pairs(script.Parent.Parent:GetChildren()) do
	    if v.Name ~= "FieldTouch" then
	        if v.Health.Value < 2 then
	            local median = (v.Size.Y - v.Health.Value)
	            v.Size = v.Size - Vector3.new(0,median,0)
		    if v.Position.Y - median >=1 then
	            	v.Position = v.Position - Vector3.new(0,median,0)
		    else 
			v.Position = v.Position - Vector3.new(0,median / 2,0)
		   end
	        end
	    end
	end
end

What that does, is if the part is shrinking and going down and about to go through the baseplate, then it will make it only shrink and not go down.

Let me know if this worked by accepting my answer! If it still didn't work, or you have trouble understanding something, leave a comment and I will reply.