What Material To Use For Repair

[JAS21]

Guys

My house is about 8 years old now ... the builder added on some bits but didn't pile to the same level as the house ... this resulted in the add ons dropping a bit. He then had to do a massive job of repiling and putting cross pieces in to hold things up ... this was done about a year later!! .

So over the years the add ons have dropped slightly but now appeared to have settled on the cross supports. So I now want to repair the exterior mouldings. I have now cut (prepared) the moulding ready to make it all look good gain. In the uk I would have used bonding and then maybe likely skimmed over later to get a smooth finish.

So here what should I use ... do they have anything simular ... it looks like the mouldings are made from something like those light block and then have been skimmed over. Suppose I could completely cut out the offending bits and cut a block to size and then skim with glue cement.... any other ideas?

Thanks

[Morakot]

What are these light blocks made of? Something like this? https://www.google.co.th/images?q=Autoclaved+aerated+concrete&oe=utf-8&rls=org.mozilla%3Aen-US%3Aofficial&client=firefox-a&channel=rcs&gbv=1&sei=xLH2ULbpOYjZrQf37oDQAw&hl=th&sa=X&oi=image_result_group