What you are proposing will not work. Only a matter of time before you have major water infiltration issues. The time to fix this correctly is now before anything else is done to the roof deck. What sort of wooden tiles? What will waterproof this roof if it is even waterproof currently? This sounds like a calamity of errors in my honest opinion.

Your back yard is covered in tar paper?!?

This isn't a roof or anything? It's all just sitting on the dirt?

So it's just some kind of method of preventing weeds from growing up through it?

If that's the case, then I guess I agree with the landlord. Who really cares what you do. I feel like rubber cement is the wrong product (if it really is tar paper), but does it really matter?

Why are you doing this work and not the landlord though?

I suspect ESL and maybe not in the US

To the OP, a licensed contractor would: obtain permits, remove the existing material and replace based on requirements.

Rubber Cement May be a generic term to the landlord, vs construction adhesive.

the OP wants a patio the landlord doesn’t care.

Do what you want.

eta: I think the landlord does not want staples and nails, and is using “rubber cement” because he doesn’t know the difference between “rubber cement” and “construction adhesive”. Seems to be: a DIY novice and a hands off landlord.

Thanks everyone for responding. This is in New York City, where landlords tend to be a little more hands-off. It’s definitely a jerry-rig fix just because it will be cheaper in the short term.

So it sounds like construction adhesive is the way to go. And possibly adhering another sheet of tarpaper over the “mended” bulge to prevent water from leaking in.

That sure looks like a rooftop to me.

Re rooftop: that is common in urban areas.

To the OP, no your plan will cause future problems, e.g., water runoff.

There are building codes in the US to prevent “jerry rig” installations from creating problems. I do not think you have an internet diy question.

are you interested in hiring a licensed contractor?

No. There are a number of problems here and you could put yourself at liability when they go wrong. This should be left to a qualified low-slope contractor.